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  • 1.
    Benedek, Peter
    et al.
    Swiss Fed Inst Technol, Dept Informat Technol & Elect Engn, CH-8092 Zurich, Switzerland..
    Forslund, Ola Kenji
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Yazdani, Nuri
    Swiss Fed Inst Technol, Dept Informat Technol & Elect Engn, CH-8092 Zurich, Switzerland..
    Matsubara, Nami
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Sassa, Yasmine
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Juranyi, Fanni
    Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland..
    Medarde, Marisa
    Paul Scherrer Inst, Lab Multiscale Mat Experiments, CH-5232 Villigen, Switzerland..
    Telling, Mark
    Rutherford Appleton Lab, ISIS Neutron & Muon Facil, Didcot OX11 0QX, Oxon, England..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Wood, Vanessa
    Swiss Fed Inst Technol, Dept Informat Technol & Elect Engn, CH-8092 Zurich, Switzerland..
    Quantifying Diffusion through Interfaces of Lithium-Ion Battery Active Materials2020In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 12, no 14, p. 16243-16249Article in journal (Refereed)
    Abstract [en]

    Detailed understanding of charge diffusion processes in a lithium-ion battery is crucial to enable its systematic improvement. Experimental investigation of diffusion at the interface between active particles and the electrolyte is challenging but warrants investigation as it can introduce resistances that, for example, limit the charge and discharge rates. Here, we show an approach to study diffusion at interfaces using muon spin spectroscopy. By performing measurements on LiFePO4 platelets with different sizes, we determine how diffusion through the LiFePO4 (010) interface differs from that in the center of the particle (i.e., bulk diffusion). We perform ab initio calculations to aid the understanding of the results and show the relevance of our interfacial diffusion measurement to electrochemical performance through cyclic voltammetry measurements. These results indicate that surface engineering can be used to improve the performance of lithium-ion batteries.

  • 2.
    Brett, Calvin
    et al.
    KTH, School of Engineering Sciences (SCI), Engineering Mechanics. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. Deutsches Elektronen Synchrotron, Notkestraße 85, Hamburg, Germany.
    Forslund, Ola Kenji
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Kreuzer, L.P
    TU München, Germany.
    Widmann, T.
    TU München, Germany.
    Porcar, L.
    Institut Laue-Langevin, 71 Avenue des Martyrs, Grenoble, France.
    Yamada, N. L.
    High Energy Accelerator Research Organization (KEK), 203-1 Shirakata, Tokai, Naka 319-1106, Japan.
    Matsubara, Nami
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Müller-Buschbaum, P.
    TU München, Germany.
    Söderberg, Daniel
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. KTH, School of Engineering Sciences (SCI), Engineering Mechanics.
    Roth, Stephan V.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. Deutsches Elektronen Synchrotron, Notkestraße 85, Hamburg, Germany.
    Humidity-Induced Nanoscale Restructuring in PEDOT:PSS and Cellulose Nanofibrils Reinforced Biobased Organic Electronics2021In: Advanced Electronic Materials, E-ISSN 2199-160X, Vol. 7, no 6, p. 2100137-, article id 2100137Article in journal (Refereed)
    Abstract [en]

    In times where research focuses on the use of organic polymers as a base for complex organic electronic applications and improving device efficiencies, degradation is still less intensively addressed in fundamental studies. Hence, advanced neutron scattering methods are applied to investigate a model system for organic electronics composed of the widely used conductive polymer blend poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) together with nanocellulose as flexible reinforcing template material. In particular, the impact of relative humidity (RH) on the nanostructure evolution is studied in detail. The implications are discussed from a device performance point of view and the changing nanostructure is correlated with macroscale physical properties such as conductivity. The first humidification (95% RH) leads to an irreversible decrease of conductivity. After the first humidification cycle, however, the conductivity can be reversibly regained when returning to low humidity values (5% RH), which is important for device manufacturing. This finding can directly contribute to an improved usability of emerging organic electronics in daily live.

  • 3.
    Brett, Calvin
    et al.
    KTH, School of Engineering Sciences (SCI), Engineering Mechanics. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.
    Forslund, Ola Kenji
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Kreuzer, Lucas
    Wiedmann, Tobias
    Porcar, Lionel
    Yamada, Norifumi
    Matsubara, Nami
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Müller-Buschbaum, Peter
    Söderberg, Daniel
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Fiberprocesser.
    Roth, Stephan V.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Biocomposites.
    Humidity-induced Nanoscale Restructuring in PEDOT:PSS and Cellulose reinforced Bio-based Organic ElectronicsManuscript (preprint) (Other academic)
  • 4.
    Facio, Jorge I.
    et al.
    Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Argentina.;CNEA, Inst Balseiro, RA-8400 San Carlos De Bariloche, Argentina.;IFW Dresden & Wurzburg Dresden Cluster Excellence, Inst Theoret Solid State Phys, Helmholtzstr 20, D-01069 Dresden, Germany.;Inst Nanociencia & Nanotecnol CNEA CONICET, San Carlos De Bariloche, Argentina..
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Fulga, Ion C.
    IFW Dresden & Wurzburg Dresden Cluster Excellence, Inst Theoret Solid State Phys, Helmholtzstr 20, D-01069 Dresden, Germany..
    Wawrzynczak, Rafal
    Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany..
    Brown, Joanna
    Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany..
    Gu, Genda
    Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Div, Upton, NY 11973 USA..
    Li, Qiang
    Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Div, Upton, NY 11973 USA.;SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Sassa, Yasmine
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Ivashko, Oleh
    DESY, Notkestr 85, D-22607 Hamburg, Germany..
    Zimmermann, Martin, V
    DESY, Notkestr 85, D-22607 Hamburg, Germany..
    Mende, Felix
    Tech Univ Dresden, Inst Theoret Phys, D-01069 Dresden, Germany.;Tech Univ Dresden, Wurzburg Dresden Cluster Excellence Ct Qmat, D-01069 Dresden, Germany..
    Gooth, Johannes
    Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany.;Univ Bonn, Phys Inst, Nussallee 12, D-53115 Bonn, Germany..
    Galeski, Stanislaw
    Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany.;Univ Bonn, Phys Inst, Nussallee 12, D-53115 Bonn, Germany..
    van den Brink, Jeroen
    IFW Dresden & Wurzburg Dresden Cluster Excellence, Inst Theoret Solid State Phys, Helmholtzstr 20, D-01069 Dresden, Germany.;Tech Univ Dresden, Inst Theoret Phys, D-01069 Dresden, Germany.;Tech Univ Dresden, Wurzburg Dresden Cluster Excellence Ct Qmat, D-01069 Dresden, Germany..
    Meng, Tobias
    Tech Univ Dresden, Inst Theoret Phys, D-01069 Dresden, Germany.;Tech Univ Dresden, Wurzburg Dresden Cluster Excellence Ct Qmat, D-01069 Dresden, Germany..
    Engineering a pure Dirac regime in ZrTe52023In: SciPost Physics, E-ISSN 2542-4653, Vol. 14, no 4, article id 066Article in journal (Refereed)
    Abstract [en]

    Real-world topological semimetals typically exhibit Dirac and Weyl nodes that coexist with trivial Fermi pockets. This tends to mask the physics of the relativistic quasiparti-cles. Using the example of ZrTe5, we show that strain provides a powerful tool for in-situ tuning of the band structure such that all trivial pockets are pushed far away from the Fermi energy, but only for a certain range of Van der Waals gaps. Our results naturally reconcile contradicting reports on the presence or absence of additional pockets in ZrTe5, and provide a clear map of where to find a pure three-dimensional Dirac semimetallic phase in the structural parameter space of the material.

  • 5.
    Forslund, Ola Kenji
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Andreica, D.
    Sassa, Y.
    Nozaki, H.
    Umegaki, I.
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Jonsson, Viktor
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Tjernberg, Oscar
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Guguchia, Z.
    Shermadini, Z.
    Khasanov, R.
    Isobe, M.
    Takagi, H.
    Ueda, Y.
    Sugiyama, J.
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Magnetic phase diagram of K 2 Cr 8 O 16 clarified by high-pressure muon spin spectroscopy2019In: Scientific Reports, E-ISSN 2045-2322, Vol. 9, no 1, article id 1141Article in journal (Refereed)
    Abstract [en]

    The K 2 Cr 8 O 16 compound belongs to a series of quasi-1D compounds with intriguing magnetic properties that are stabilized through a high-pressure synthesis technique. In this study, a muon spin rotation, relaxation and resonance (μ + SR) technique is used to investigate the pressure dependent magnetic properties up to 25 kbar. μ + SR allows for measurements in true zero applied field and hereby access the true intrinsic material properties. As a result, a refined temperature/pressure phase diagram is presented revealing a novel low temperature/high pressure (p C1 = 21 kbar) transition from a ferromagnetic insulating to a high-pressure antiferromagnetic insulator. Finally, the current study also indicates the possible presence of a quantum critical point at p C2 ~ 33 kbar where the magnetic order in K 2 Cr 8 O 16 is expected to be fully suppressed even at T = 0 K.

  • 6.
    Forslund, Ola Kenji
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Papadopoulos, Konstantinos
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Morris, Gerald
    TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada..
    Hitti, Bassam
    TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada..
    Arseneau, Donald
    TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada..
    Pomjakushin, Vladimir
    Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland..
    Matsubara, Nami
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Orain, Jean-Christophe
    Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland..
    Svedlindh, Peter
    Uppsala Univ, Dept Mat Sci & Engn, Box 35, SE-75103 Uppsala, Sweden..
    Andreica, Daniel
    Babes Bolyai Univ, Fac Phys, Cluj Napoca 400084, Romania..
    Jana, Somnath
    Indian Assoc Cultivat Sci, Ctr Adv Mat, Kolkata 700032, India..
    Sugiyama, Jun
    Comprehens Res Org Sci & Soc CROSS, Neutron Sci & Technol Ctr, Tokai, Ibaraki 3191106, Japan..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Sassa, Yasmine
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Intertwined magnetic sublattices in the double perovskite compound LaSrNiReO62020In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 102, no 14, article id 144409Article in journal (Refereed)
    Abstract [en]

    We report a muon spin rotation (mu+SR) study of the magnetic properties of the double perovskite compound LaSrNiReO6. Using the unique length and time scales of the mu+SR technique, we successfully clarify the magnetic ground state of LaSrNiReO6, which was previously deemed as a spin glass state. Instead, our mu+SR results point toward a long-range dynamically ordered ground state below T-C = 23 K, for which a static limit is foreseen at T = 0. Furthermore, between 23 K < T <= 300 K, three different magnetic phases are identified: a dense (23 K < T < 75 K), a dilute (75 K <= T <= 250 K), and a paramagnetic (T > 250 K) state. Our results reveal how two separate yet intertwined magnetic lattices interact within the unique double perovskite structure and the importance of using complementary experimental techniques to obtain a complete understanding of the microscopic magnetic properties of complex materials.

  • 7.
    Ge, Yuqing
    et al.
    Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden..
    Andreica, Daniel
    Univ Babes Bolyai, Fac Phys, Cluj Napoca 400084, Romania..
    Sassa, Yasmine
    Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden..
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Pomjakushina, Ekaterina
    Paul Scherrer Inst, Lab Multiscale Mat Expt, Villigen, Switzerland..
    Khasanov, Rustem
    Paul Scherrer Inst, Lab Muon Spin Spect, Villigen, Switzerland..
    Ronnow, Henrik M.
    Ecole Polytech Fed Lausanne, Lab Quantum Magnetism LQM, Lausanne, Switzerland..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Forslund, Ola Kenji
    Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden..
    Confirming the high pressure phase diagram of the Shastry-Sutherland model2023In: Proceedings 15th International Conference on Muon Spin Rotation, Relaxation and Resonance (SR) / [ed] Prando, G Pratt, F, IOP Publishing , 2023, Vol. 2462, article id 012042Conference paper (Refereed)
    Abstract [en]

    A Muon Spin Rotation (mu+SR) study was conducted to investigate the magnetic properties of SrCu2(BO3)(2) (SCBO) as a function of temperature/pressure. Measurements in zero field and transverse field confirm the absence of long range magnetic order at high pressures and low temperatures. These measurements suggest changes in the Cu spin fluctuations characteristics above 21 kbar, consistent with the formation of a plaquette phase as previously suggested by inelastic neutron scattering measurements. SCBO is the only known realisation of the Shatry-Sutherland model, thus the ground state mediating the dimer and antiferromagnetic phase is likekly to be a plaquette state.

  • 8.
    Horio, M.
    et al.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
    Hauser, K.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
    Sassa, Y.
    Uppsala Univ, Dept Phys & Astron, SE-75121 Uppsala, Sweden..
    Mingazheva, Z.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
    Sutter, D.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
    Kramer, K.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
    Cook, A.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Forslund, Ola Kenji
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Tjernberg, Oscar
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Kobayashi, M.
    Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland..
    Chikina, A.
    Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland..
    Schroter, N. B. M.
    Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland..
    Krieger, J. A.
    Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland.;Swiss Fed Inst Technol, Lab Festkorperphys, CH-8093 Zurich, Switzerland..
    Schmitt, T.
    Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland..
    Strocov, V. N.
    Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland..
    Pyon, S.
    Univ Tokyo, Dept Adv Mat, Kashiwa, Chiba 2778561, Japan..
    Takayama, T.
    Univ Tokyo, Dept Adv Mat, Kashiwa, Chiba 2778561, Japan..
    Takagi, H.
    Univ Tokyo, Dept Adv Mat, Kashiwa, Chiba 2778561, Japan..
    Lipscombe, O. J.
    Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England..
    Hayden, S. M.
    Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England..
    Ishikado, M.
    CROSS, Tokai, Ibaraki 3191106, Japan..
    Eisaki, H.
    Natl Inst Adv Ind Sci & Technol, Elect & Photon Res Inst, Tsukuba 3058568, Japan..
    Neupert, T.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Matt, C. E.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland.;Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland.;Harvard Univ, Dept Phys, Cambridge, MA 02138 USA..
    Chang, J.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
    Three-Dimensional Fermi Surface of Overdoped La-Based Cuprates2018In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 121, no 7, article id 077004Article in journal (Refereed)
    Abstract [en]

    We present a soft x-ray angle-resolved photoemission spectroscopy study of overdoped high-temperature superconductors. In-plane and out-of-plane components of the Fermi surface are mapped by varying the photoemission angle and the incident photon energy. No k(z) dispersion is observed along the nodal direction, whereas a significant antinodal k(z) dispersion is identified for La-based cuprates. Based on a tight-binding parametrization, we discuss the implications for the density of states near the van Hove singularity. Our results suggest that the large electronic specific heat found in overdoped La2-xSrxCuO4 cannot be assigned to the van Hove singularity alone. We therefore propose quantum criticality induced by a collapsing pseudogap phase as a plausible explanation for observed enhancement of electronic specific heat.

  • 9.
    Jana, Somnath
    et al.
    Indian Assoc Cultivat Sci, Ctr Adv Mat, Kolkata 700032, India.;Uppsala Univ, Dept Phys & Astron, S-75236 Uppsala, Sweden.;Helmholtz Zentrum Berlin Mat & Energie, Inst Methods & Instrumentat Synchrotron Radiat Re, Albert Einstein Str 15, D-12489 Berlin, Germany..
    Aich, Payel
    Indian Assoc Cultivat Sci, Sch Mat Sci, Kolkata, India..
    Kumar, P. Anil
    Uppsala Univ, Dept Engn Sci, S-75236 Uppsala, Sweden.;Seagate Technol, 1 Disc Dr, Springtown BT48 0BF, North Ireland..
    Forslund, Ola Kenji
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Pomjakushin, V.
    Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Sassa, Y.
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Svedlindh, Peter
    Uppsala Univ, Dept Engn Sci, S-75236 Uppsala, Sweden..
    Karis, Olof
    Uppsala Univ, Dept Phys & Astron, S-75236 Uppsala, Sweden..
    Siruguri, Vasudeva
    Bhabha Atom Res Ctr, UGC DAE Consortium Sci Res Mumbai Ctr, 246C 2nd Floor,Common Facil Bldg CFB, Mumbai 400085, Maharashtra, India..
    Ray, Sugata
    Indian Assoc Cultivat Sci, Ctr Adv Mat, Kolkata 700032, India.;Indian Assoc Cultivat Sci, Sch Mat Sci, Kolkata, India..
    Revisiting Goodenough-Kanamori rules in a new series of double perovskites LaSr1-xCaxNiReO62019In: Scientific Reports, E-ISSN 2045-2322, Vol. 9, article id 18296Article in journal (Refereed)
    Abstract [en]

    The magnetic ground states in highly ordered double perovskites LaSr1-xCaxNiReO6 (x = 0.0, 0.5, 1.0) are studied in view of the Goodenough-Kanamori rules of superexchange interactions in this paper. In LaSrNiReO6, Ni and Re sublattices are found to exhibit curious magnetic states separately, but no long range magnetic ordering is achieved. The magnetic transition at similar to 255 K is identified with the independent Re sublattice magnetic ordering. Interestingly, the sublattice interactions are tuned by modifying the Ni-O-Re bond angles through Ca doping. Upon Ca doping, the Ni and Re sublattices start to display a ferrimagnetically ordered state at low temperature. The neutron powder diffraction data reveals long range ferrimagnetic ordering of the Ni and Re magnetic sublattices along the crystallographic b-axis. The transition temperature of the ferrimagnetic phase increases monotonically with increasing Ca concentration.

  • 10.
    John Mukkattukavil, Deepak
    et al.
    Uppsala Univ, Dept Phys & Astron, Box 516, SE-75120 Uppsala, Sweden..
    Hellsvik, Johan
    KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory. KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Ghosh, Anirudha
    Lund Univ, MAX Lab 4, SE-22100 Lund, Sweden..
    Chatzigeorgiou, Evanthia
    Uppsala Univ, Dept Phys & Astron, Box 516, SE-75120 Uppsala, Sweden..
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Wang, Qisi
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
    von Arx, Karin
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
    Huang, Shih-Wen
    Lund Univ, MAX Lab 4, SE-22100 Lund, Sweden..
    Ekholm, Victor
    Lund Univ, MAX Lab 4, SE-22100 Lund, Sweden..
    Hossain, Zakir
    Indian Inst Technol, Dept Phys, Kanpur 208016, Uttar Pradesh, India..
    Thamizhavel, Arumugum
    Tata Inst Fundamental Res, DCMPMS, Mumbai 400005, Maharashtra, India..
    Chang, Johan
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Nordstrom, Lars
    Uppsala Univ, Dept Phys & Astron, Box 516, SE-75120 Uppsala, Sweden..
    Sathe, Conny
    Lund Univ, MAX Lab 4, SE-22100 Lund, Sweden..
    Agaker, Marcus
    Uppsala Univ, Dept Phys & Astron, Box 516, SE-75120 Uppsala, Sweden.;Lund Univ, MAX Lab 4, SE-22100 Lund, Sweden..
    Rubensson, Jan-Erik
    Uppsala Univ, Dept Phys & Astron, Box 516, SE-75120 Uppsala, Sweden..
    Sassa, Yasmine
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Resonant inelastic soft x-ray scattering on LaPt2Si22022In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 34, no 32, p. 324003-, article id 324003Article in journal (Refereed)
    Abstract [en]

    X-ray absorption and resonant inelastic x-ray scattering spectra of LaPt2Si2 single crystal at the Si 2p and La 4d edges are presented. The data are interpreted in terms of density functional theory, showing that the Si spectra can be described in terms of Si s and d local partial density of states (LPDOS), and the La spectra are due to quasi-atomic local 4f excitations. Calculations show that Pt d-LPDOS dominates the occupied states, and a sharp localized La f state is found in the unoccupied states, in line with the observations.

  • 11.
    Ma, Le Anh
    et al.
    Angstrom Lab, Dept Chem, Uppsala, Sweden..
    Palm, Rasmus
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Forslund, Ola Kenji
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Matsubara, Nami
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Cottrell, Stephen
    STFC Rutherford Appleton Lab, ISIS Pulsed Neutron & Muon Facil, Didcot OX11 0QX, Oxon, England..
    Yokoyama, Koji
    STFC Rutherford Appleton Lab, ISIS Pulsed Neutron & Muon Facil, Didcot OX11 0QX, Oxon, England..
    Koda, Akihiro
    High Energy Accelerator Res Org KEK, Tokai, Ibaraki 3191106, Japan..
    Sugiyama, Jun
    Comprehens Res Org Sci & Soc CROSS, Neutron Sci & Technol Ctr, Tokai, Ibaraki 3191106, Japan.;Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan..
    Sassa, Yasmine
    Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Younesi, Reza
    Angstrom Lab, Dept Chem, Uppsala, Sweden..
    Na-ion mobility in P2-type Na0.5MgxNi0.17-xMn0.83O2 (0 <= x <= 0.07) from electrochemical and muon spin relaxation studies2021In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 23, no 42, p. 24478-24486Article in journal (Refereed)
    Abstract [en]

    Sodium transition metal oxides with a layered structure are one of the most widely studied cathode materials for Na+-ion batteries. Since the mobility of Na+ in such cathode materials is a key factor that governs the performance of material, electrochemical and muon spin rotation and relaxation techniques are here used to reveal the Na+-ion mobility in a P2-type Na0.5MgxNi0.17-xMn0.83O2 (x = 0, 0.02, 0.05 and 0.07) cathode material. Combining electrochemical techniques such as galvanostatic cycling, cyclic voltammetry, and the galvanostatic intermittent titration technique with mu+SR, we have successfully extracted both self-diffusion and chemical-diffusion under a potential gradient, which are essential to understand the electrode material from an atomic-scale viewpoint. The results indicate that a small amount of Mg substitution has strong effects on the cycling performance and the Na+ mobility. Amongst the tested cathode systems, it was found that the composition with a Mg content of x = 0.02 resulted in the best cycling stability and highest Na+ mobility based on electrochemical and mu+SR results. The current study clearly shows that for developing a new generation of sustainable energy-storage devices, it is crucial to study and understand both the structure as well as dynamics of ions in the material on an atomic level.

  • 12.
    Matsubara, Nami
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Masese, Titus
    Suard, Emmanuelle
    Forslund, Ola Kenji
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Palm, Rasmus
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Guguchia, Zurab
    Andreica, Daniel
    Hardut, Alexandra
    Ishikado, Motoyuki
    Papadopoulos, Konstantinos
    Sassa, Yasmine
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Cation Distributions and Magnetic Properties of Ferrispinel MgFeMnO42020In: Inorganic Chemistry, ISSN 0020-1669, E-ISSN 1520-510X, Vol. 59, no 24, p. 17970-17980Article in journal (Refereed)
    Abstract [en]

    The crystal structure and magnetic properties of the cubic spinel MgFeMnO4 were studied by using a series of in-house techniques along with large-scale neutron diffraction and muon spin rotation spectroscopy in the temperature range between 1.5 and 500 K. The detailed crystal structure is successfully refined by using a cubic spinel structure described by the space group Fd (3) over barm. Cations within tetrahedral A and octahedral B sites of the spinel were found to be in a disordered state. The extracted fractional site occupancies confirm the presence of antisite defects, which are of importance for the electrochemical performance of MgFeMnO4 and related battery materials. Neutron diffraction and muon spin spectroscopy reveal a ferrimagnetic order below T-C = 394.2 K, having a collinear spin arrangement with antiparallel spins at the A and B sites, respectively. Our findings provide new and improved understanding of the fundamental properties of the ferrispinel materials and of their potential applications within future spintronics and battery devices.

  • 13.
    Matsubara, Nami
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Forslund, Ola Kenji
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Zubayer, Anton
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Papadopoulos, Konstantinos
    Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden..
    Andreica, Daniel
    Babes Bolyai Univ, Fac Phys, Cluj Napoca 400084, Romania..
    Sugiyama, Jun
    Comprehens Res Org Sci & Soc CROSS, Neutron Sci & Technol Ctr, Tokai, Ibaraki 3191106, Japan..
    Palm, Rasmus
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Guguchia, Zurab
    Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland..
    Cottrell, Stephen P.
    Rutherford Appleton Lab, ISIS Muon Facil, Didcot OX11 0QX, Oxon, England..
    Kamiyama, Takashi
    High Energy Accelerator Res Org, Inst Mat Struct Sci, 203-1 Shirakata, Tokai, Ibaraki 3191106, Japan..
    Saito, Takashi
    High Energy Accelerator Res Org, Inst Mat Struct Sci, 203-1 Shirakata, Tokai, Ibaraki 3191106, Japan..
    Kalaboukhov, Alexei
    Chalmers Univ Technol, Microtechnol & Nanosci, S-41296 Gothenburg, Sweden..
    Sassa, Yasmine
    Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden..
    Masese, Titus
    Natl Inst Adv Ind Sci & Technol, Res Inst Electrochem Energy RIECEN, Dept Energy & Environm, Ikeda, Osaka 5638577, Japan.;Natl Inst Adv Ind Sci & Technol, AIST Kyoto Univ Chem Energy Mat Open Innovat Lab, Sakyo Ku, Kyoto 6068501, Japan..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Magnetism and ion diffusion in honeycomb layered oxide K2Ni2TeO62020In: Scientific Reports, E-ISSN 2045-2322, Vol. 10, no 1, article id 18305Article in journal (Refereed)
    Abstract [en]

    In the quest for developing novel and efficient batteries, a great interest has been raised for sustainable K-based honeycomb layer oxide materials, both for their application in energy devices as well as for their fundamental material properties. A key issue in the realization of efficient batteries based on such compounds, is to understand the K-ion diffusion mechanism. However, investigation of potassium-ion (K+) dynamics in materials using e.g. NMR and related techniques has so far been very challenging, due to its inherently weak nuclear magnetic moment, in contrast to other alkali ions such as lithium and sodium. Spin-polarised muons, having a high gyromagnetic ratio, make the muon spin rotation and relaxation (mu+SR) technique ideal for probing ions dynamics in these types of energy materials. Here we present a study of the low-temperature magnetic properties as well as K+ dynamics in honeycomb layered oxide material K2Ni2TeO6 using mainly the mu+SR technique. Our low-temperature mu+SR results together with complementary magnetic susceptibility measurements find an antiferromagnetic transition at T-N approximate to 27 K. Further mu+SR studies performed at higher temperatures reveal that potassium ions (K+) become mobile above 200 K and the activation energy for the diffusion process is obtained as E-a = 121(13) meV. This is the first time that K+ dynamics in potassium-based battery materials has been measured using mu+SR. Assisted by high-resolution neutron diffraction, the temperature dependence of the K-ion self diffusion constant is also extracted. Finally our results also reveal that K-ion diffusion occurs predominantly at the surface of the powder particles. This opens future possibilities for potentially improving ion diffusion as well as K-ion battery device performance using nano-structuring and surface coatings of the particles.

  • 14.
    Matsubara, Nami
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Kamazawa, K.
    Forslund, Ola Kenji
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Sassa, Y.
    Keller, L.
    Sikolenko, V. V.
    Pomjakushin, V.
    Sakurai, H.
    Sugiyama, J.
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Neutron powder diffraction study of NaMn2O4 and Li0.92Mn2O4 : Insights on spin-charge-orbital ordering2020In: Physical Review Research, E-ISSN 2643-1564, Vol. 2, no 4, article id 043143Article in journal (Refereed)
    Abstract [en]

    High-pressure synthesized quasi-one-dimensional NaMn2O4 and Li0.92Mn2O4 are both antiferromagnetic insulators. Here their atomic and magnetic structures are investigated using neutron powder diffraction. The present crystal structural analyses of NaMn2O4 reveal that a Mn3+/Mn4+ charge-ordering state exists even at low temperature (down to 1.5 K). It is evident that one of the Mn sites shows a strongly distorted Mn3+ octahedron due to the Jahn-Teller effect. Above TN=35 K, a two-dimensional short-range correlation is observed, as indicated by asymmetric diffuse scattering. Below TN, two antiferromagnetic transitions are observed: (i) a commensurate long-range Mn3+ spin ordering below TN1=35 K and (ii) an incommensurate Mn4+ spin ordering below TN2=11 K. Surprisingly, the two antiferromagnetic orders are found to be independent of each other. The commensurate magnetic structure (kC=0.5,0.5,0.5) follows the magnetic anisotropy of the local easy axes of Mn3+, while the incommensurate Mn4+ one shows a spin-density-wave or a cycloidal order with kIC=(0,0,0.216). For Li0.92Mn2O4, on the other hand, the absence of a long-range spin-ordered state is confirmed down to 1.5 K.

  • 15.
    Miniotaite, Ugne
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Forslund, Ola Kenji
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Elson, Frank
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Palm, Rasmus
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Matsubara, Nami
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Ge, Yuqing
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Khasanov, Rustem
    Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland..
    Kobayashi, Genki
    RIKEN, Solid State Chem Lab, Cluster Pioneering Res CPR, 2-1 Hirosawa, Wako, Saitama 3510198, Japan.;Natl Inst Nat Sci, Inst Mol Sci, Dept Mat Mol Sci, 38 Nishigonaka, Okazaki, Aichi 4448585, Japan..
    Sassa, Yasmine
    Department of Physics, Chalmers University of Technology, Göteborg, SE-412 96, Sweden .
    Weissenrieder, Jonas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Pomjakushin, Vladimir
    Paul Scherrer Inst, Lab Neutron Scattering Imaging, CH-5232 Villigen, Switzerland..
    Andreica, Daniel
    Univ Babes Bolyai, Fac Phys, Cluj Napoca 400084, Romania..
    Sugiyama, Jun
    Comprehens Res Org Sci & Soc CROSS, Neutron Sci & Technol Ctr, Tokai, Ibaraki 3191106, Japan..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Magnetic Properties of Multifunctional (LiFePO4)-Li-7 under Hydrostatic Pressure2023In: Proceedings 15th International Conference on Muon Spin Rotation, Relaxation and Resonance (SR) / [ed] Prando, G Pratt, F, IOP Publishing , 2023, Vol. 2462, article id 012049Conference paper (Refereed)
    Abstract [en]

    LiFePO4 (LFPO) is an archetypical and well-known cathode material for rechargeable Li-ion batteries. However, its quasi-one-dimensional (Q1D) structure along with the Fe ions, LFPO also displays interesting low-temperature magnetic properties. Our team has previously utilized the muon spin rotation (mu+SR) technique to investigate both magnetic spin order as well as Li-ion diffusion in LFPO. In this initial study we extend our investigation and make use of high-pressure mu+SR to investigate effects on the low-T magnetic order. Contrary to theoretical predictions we find that the magnetic ordering temperature as well as the ordered magnetic moment increase at high pressure (compressive strain).

  • 16.
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    A Comprehensive Experimental Approach to Multifunctional Quantum Materials and their Physical Properties: Geometry and Physics in Condensed Matter2022Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis ranges within the vast framework of experimental condensed matter physics. Several different systems, and physical phenomena, are presented here from a structuralist standpoint. In fact, we show how, in solid condensed matter, the underlying arrangement of atoms, the symmetry of their structure, and their mutual interactions, underpin the form and the nature of their collective emergent properties. Our effort in this work was focused on unveiling complex magnetic ground states in newly synthesized materials, as well as in the clarification of unconventional symmetry breaking phenomena in highly debated systems. In all cases, we could understand the physics of such systems only when we elucidated the details, and temperature dependent evolution, of their structures.

    About the choice of target materials for our investigations, our starting point has not only been fundamental condensed matter physics, but also forward looking towards a sustainable future. Here we considered both the development of energy efficient spintronics and quantum computing, as well as the need for efficient conversion and storage of clean energy. Therefore, this project is concerned with the advanced characterization of novel ”multifunctional” materials, that constitute a unique playground for fundamental scientific research, but also lend themselves to potential novel technical applications. Such materials might indeed display high temperature dynamical properties, which make them suitable for rechargeable batteries and heat conduction applications. At the same time, they are also strongly correlated electron systems at lower temperatures, and their fundamental magnetic and electronic properties are relevant for the development of quantum devices. To explore these properties, extensive experimental studies using large-scale research facilities were employed. In this project, several unique and powerful state-of-the-art high-resolution neutron scattering, X-ray scattering, and muon spin rotation techniques were used.

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  • 17.
    Nocerino, Elisabetta
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Forslund, Ola K.
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Wang, Chennan
    Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland..
    Sakurai, Hiroya
    Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan..
    Elson, Frank
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Palm, Rasmus
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Miniotaite, Ugne
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Ge, Yuqing
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Sassa, Yasmine
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Sugiyama, Jun
    Comprehens Res Org Sci & Soc CROSS, Neutron Sci & Technol Ctr, Tokai, Ibaraki 3191106, Japan..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Magnetic nature of wolframite MgReO42023In: 15th International Conference on Muon Spin Rotation, Relaxation and Resonance, MuSR 2022 / [ed] Prando, G Pratt, F, IOP Publishing , 2023, Vol. 2462, article id 012037Conference paper (Refereed)
    Abstract [en]

    Rhenium oxides belonging to the family AReO4 where A is a metal cation, exhibit interesting electronic and magnetic properties. In this study we have utilized the muon spin rotation/relaxation (mu+SR) technique to study the magnetic properties of the MgReO4 compound. To the best of our knowledge, this is the first investigation reported on this interesting material, that is stabilized in a wolframite crystal structure using a special highpressure synthesis technique. Bulk magnetic studies show the onset of an antiferromagnetic (AF) long range order, or a possible singlet spin state at T-C1 approximate to 90 K, with a subtle second hightemperature transition at T-C2 approximate to 280 K. Both transitions are also confirmed by heat capacity (Cp) measurements. From our mu+SR measurements, it is clear that the sample enters an AF order below T-C1 = T-N approximate to 85 K. We find no evidence of magnetic signal above TN, which indicates that T-C2 is likely linked to a structural transition. Further, via sensitive zero field (ZF) mu(+) SR measurements we find evidence of a spin reorientation at T-Cant approximate to 65 K. This points towards a transition from a collinear AF into a canted AF order at low temperature, which is proposed to be driven by competing magnetic interactions.

  • 18.
    Nocerino, Elisabetta
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Forslund, Ola Kenji
    Sakurai, Hiroya
    Hoshikawa, Akinori
    Matsubara, Nami
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Andreica, Daniel
    Zubayer, Anton
    Mazza, Federico
    Orain, Jean-Christophe
    Saito, Takashi
    Sugiyama, Jun
    Umegaki, Izumi
    Sassa, Yasmine
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Revised Magnetic structure and tricritical behavior of the CMR Compound NaCr2O4 investigated with High Resolution Neutron Diffraction and μ+SR.Manuscript (preprint) (Other academic)
  • 19.
    Nocerino, Elisabetta
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Forslund, Ola Kenji
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Sakurai, Hiroya
    Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan..
    Hoshikawa, Akinori
    Ibaraki Univ, Frontier Res Ctr Appl Atom Sci, 162-1 Shirakata, Tokai, Ibaraki 3191106, Japan..
    Matsubara, Nami
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Andreica, Daniel
    Babes Bolyai Univ, Fac Phys, Cluj Napoca 3400, Romania..
    Zubayer, Anton
    Linköping Univ, Dept Phys Chem & Biol IFM, SE-58183 Linköping, Sweden..
    Mazza, Federico
    TU Wien, Insitute Solid State Phys, Wiedner Haupstr 8-10, AT-1040 Vienna, Austria..
    Saito, Takashi
    High Energy Accelerator Res Org, Inst Mat Struct Sci, 203-1 Shirakata, Tokai, Ibaraki 3191107, Japan..
    Sugiyama, Jun
    Comprehens Res Org Sci & Soc CROSS, Neutron Sci & Technol Ctr, Tokai, Ibaraki 3191106, Japan.;Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan..
    Umegaki, Izumi
    KEK, Inst Mat Struct Sci, Muon Sci Lab, Tokai, Ibaraki 3191106, Japan..
    Sassa, Yasmine
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Unusually large magnetic moment and tricritical behavior of the CMR compound NaCr2O4 revealed with high resolution neutron diffraction and mu(+) SR2023In: Journal of Physics: Materials, E-ISSN 2515-7639, Vol. 6, no 3, article id 035009Article in journal (Refereed)
    Abstract [en]

    The mixed valence Cr3+/Cr4+ compound NaCr2O4, hosts a plethora of unconventional electronic properties. In the present study, muon spin rotation/relaxation (mu(+) SR) and high-resolution time-of-flight neutron powder diffraction measurements were carried out on high-quality samples to clarify the complex magnetic ground state of this unique material. We identified a commensurate canted antiferromagnetic order (C-AFM) with a canting angle of the Cr spin axial vector equal to theta

  • 20.
    Nocerino, Elisabetta
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Forslund, Ola Kenji
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Sakurai, Hiroya
    Matsubara, Nami
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Zubayer, Anton
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Mazza, Federico
    Cottrell, Stephen
    Koda, Akihiro
    Watanabe, Isao
    Hoshikawa, Akinori
    Saito, Takashi
    Sugiyama, Jun
    Sassa, Yasmine
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Na-ion Dynamics in the Solid Solution NaxCa1-xCr2O4 Studied by Muon Spin Rotation and Neutron DiffractionManuscript (preprint) (Other academic)
    Abstract [en]

    In this work we present systematic set of measurements carried out by muon spin rotation/relaxation (μ+SR) and neutron powder diffraction (NPD) on the solid solution NaxCa1−xCr2O4. This study investigates Na-ion dynamics in the quasi-1D (Q1D) diffusion channels created by the honeycomb-like arrangement of CrO6 octahedra, in the presence of defects introduced by Ca doping. With increasing Ca content, the size of the diffusion channels is enlarged, however, this effect does not enhance the Na ion mobility. Instead the overall diffusivity is hampered by the local defects and the Na hopping probability is lowered. The diffusion mechanism in NaxCa1−xCr2O4 was found to be interstitial and the activation energy as well as diffusion coefficient were determined for all the members of the solid solution. 

  • 21.
    Nocerino, Elisabetta
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Forslund, Ola Kenji
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Wang, Chennan
    Sakurai, Hiroya
    Elson, Frank
    Palm, Rasmus
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Miniotaite, Ugne
    Ge, Yuqing
    Sassa, Yasmine
    Sugiyama, Jun
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Magnetic nature of wolframite MgReO4In: ISSN 2165-5286Article in journal (Other academic)
  • 22.
    Nocerino, Elisabetta
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Kobayashi, Shintaro
    Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo, 679-5198, Japan.
    Witteveen, Catherine
    Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211, Geneva, Switzerland; Department of Physics, University of Zürich, Winterthurerstr. 190, 8057, Zürich, Switzerland.
    Forslund, Ola K.
    Chalmers University of Technology, Department of Physics, Göteborg, SE-412 96, Sweden.
    Matsubara, Nami
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Tang, Chiu
    Diamond House, Harwell Science and Innovation Campus, Fermi Ave, Didcot, OX11 0DE, UK.
    Matsukawa, Takeshi
    Frontier Research Center for Applied Atomic Sciences, Ibaraki University, 162-1 Shirakata, Tokai, Ibaraki, 319-1106, Japan.
    Hoshikawa, Akinori
    Frontier Research Center for Applied Atomic Sciences, Ibaraki University, 162-1 Shirakata, Tokai, Ibaraki, 319-1106, Japan.
    Koda, Akihiro
    Organization (KEK), Tsukuba, Ibaraki, 305-0801, Japan; Department of Materials Structure Science, The Graduate University for Advanced Studies, Tsukuba, Ibaraki, 305-0801, Japan.
    Yoshimura, Kazuyoshi
    Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan.
    Umegaki, Izumi
    Muon Science Laboratory, Institute of Materials Structure Science, KEK, Tokai, Ibaraki, 319-1106, Japan.
    Sassa, Yasmine
    Chalmers University of Technology, Department of Physics, Göteborg, SE-412 96, Sweden.
    von Rohr, Fabian O.
    Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211, Geneva, Switzerland.
    Pomjakushin, Vladimir
    Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, 5232, Villigen, PSI, Switzerland.
    Brewer, Jess H.
    Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada; TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada.
    Sugiyama, Jun
    Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki, 319-1106, Japan, Ibaraki; Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan.
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Competition between magnetic interactions and structural instabilities leading to itinerant frustration in the triangular lattice antiferromagnet LiCrSe22023In: Communications Materials, E-ISSN 2662-4443, Vol. 4, no 1, article id 81Article in journal (Refereed)
    Abstract [en]

    LiCrSe2 constitutes a recent valuable addition to the ensemble of two-dimensional triangular lattice antiferromagnets. In this work, we present a comprehensive study of the low temperature nuclear and magnetic structure established in this material. Being subject to a strong magnetoelastic coupling, LiCrSe2 was found to undergo a first order structural transition from a trigonal crystal system (P3 ¯ m1) to a monoclinic one (C2/m) at T s = 30 K. Such restructuring of the lattice is accompanied by a magnetic transition at T N = 30 K. Refinement of the magnetic structure with neutron diffraction data and complementary muon spin rotation analysis reveal the presence of a complex incommensurate magnetic structure with a up-up-down-down arrangement of the chromium moments with ferromagnetic double chains coupled antiferromagnetically. The spin axial vector is also modulated both in direction and modulus, resulting in a spin density wave-like order with periodic suppression of the chromium moment along the chains. This behavior is believed to appear as a result of strong competition between direct exchange antiferromagnetic and superexchange ferromagnetic couplings established between both nearest neighbor and next nearest neighbor Cr3+ ions. We finally conjecture that the resulting magnetic order is stabilized via subtle vacancy/charge order within the lithium layers, potentially causing a mix of two co-existing magnetic phases within the sample.

  • 23.
    Nocerino, Elisabetta
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Kobayashi, Shintaro
    Witteveen, Catherine
    Forslund, Ola Kenji
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Matsubara, Nami
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Tang, Chiu
    Matsukawa, Takeshi
    Hoshikawa, Akinori
    Koda, Akihiro
    Yoshimura, Kazuyoshi
    Umegaki, Izumi
    Sassa, Yasmine
    von Rohr, Fabian
    Pomjakushin, Vladimir
    Brewer, Jess
    Sugiyama, Jun
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    The Duel of Magnetic Interactions and Structural Instabilities: Itinerant Frustration in the Triangular Lattice Compound LiCrSe2Manuscript (preprint) (Other academic)
    Abstract [en]

    The recent synthesis of the chromium selenide compound LiCrSe2 constitutes a valuable addition to the ensemble of two-dimensional triangular lattice antiferromagnets (2D-TLA). In this work we present the very first comprehensive study of the combined low temperature nuclear and magnetic structure established in this material. Details on the connection between Li-ion dynamics and structural changes are also presented along with a direct link between atomic structure and spin order via a strong magnetoelastic coupling. LiCrSe2 was found to undergo a first order structural transition from a trigonal crystal system with space group P3¯m1 to a monoclinic one with space group C2/m at Ts=30~K. Such restructuring of the lattice is accompanied by a magnetic transition at TN=30~K, with the formation of a complex spin arrangement for the Cr3+ moments. Refinement of the magnetic structure with neutron diffraction data and complementary muon spin rotation analysis reveal the presence of two incommensurate magnetic domains with a up-up-down-down arrangement of the spins with ferromagnetic (FM) double chains coupled antiferromagnetically (AFM). In addition to this unusual arrangement, the spin axial vector is modulated both in direction and modulus, resulting in a spin density wave-like order with periodic suppression of the Cr moment along the chains. This behavior is believed to appear as a result of strong competition between direct exchange AFM and superexchange FM couplings established between both nearest neighbor and next nearest neighbor Cr3+ ions. We finally conjecture that the resulting magnetic order is stabilized via subtle vacancy/charge order within the Li layers, potentially causing a mix of two different magnetic phases within the sample.

  • 24.
    Nocerino, Elisabetta
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Sakurai, Hiroya
    Forslund, Ola Kenji
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Papadopoulos, Konstantinos
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Engineering.
    Mukkattukavil, Deepak
    Matsubara, Nami
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Andreica, Daniel
    Nozaki, Hiroshi
    Simutis, Gediminas
    Khassanov, Roustem
    Orain, Jean-Christophe
    Ishimatsu, Naoki
    Kawamura, Naomi
    Bull, Craig
    Funnell, Nick
    Sugiyama, Jun
    Umegaki, Izumi
    Sassa, Yasmine
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Pressure Dependent Magnetic properties of the Q1D Solid Solution Ca1-xNaxCr2O4 Studied with Neutrons Muons and X-RaysManuscript (preprint) (Other academic)
  • 25.
    Nocerino, Elisabetta
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    San Lorenzo, Irene
    Papadopoulos, Konstantinos
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Engineering.
    Medarde, Marisa
    Lyu, Jike
    Klein, Yannick Maximilian
    Minelli, Arianna
    Hossain, Zakir
    Thamizhavel, Arumugam
    Lefmann, Kim
    Ivashko, Oleh
    von Zimmermann, Martin
    Sassa, Yasmine
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Structural Evolution and Onset of the Density Wave Transition in the CDW Superconductor LaPt2Si2 Clarified with Synchrotron XRDManuscript (preprint) (Other academic)
    Abstract [en]

    The quasi-2D Pt-based rare earth intermetallic material LaPt2Si2 has attracted attention as it exhibits strong interplay between charge density wave (CDW) and and superconductivity (SC). However, the most of the results reported on this material come from theoretical calculations, preliminary bulk investigations and powder samples, which makes it difficult to uniquely determine the temperature evolution of its crystal structure and, consequently, of its CDW transition. Therefore, the published literature around LaPt2Si2 is often controversial. In this paper, we clarify the complex evolution of the crystal structure, and the temperature dependence of the development of density wave transitions, in good quality LaPt2Si2 single crystals, with high resolution synchrotron X-ray diffraction data. According to our findings, on cooling from room temperature LaPt2Si2 undergoes a series of subtle structural transitions which can be summarised as follows: second order commensurate tetragonal (P4/nmm)-to-incommensurate structure followed by a first order incommensurate-to-commensurate orthorhombic (Pmmn) transition and then a first order commensurate orthorhombic (Pmmn)-to-commensurate tetragonal (P4/nmm). The structural transitions are accompanied by both incommensurate and commensurate superstructural distortions of the lattice. The observed behavior is compatible with discommensuration of the CDW in this material. 

  • 26.
    Nocerino, Elisabetta
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Sanlorenzo, Irene
    Nanoscience Center, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen, Denmark, Universitetsparken 5; Department of Applied Science and Technology, Politecnico di Torino, corso Duca degli abruzzi 24, 10129, Torino, Italy, corso Duca degli abruzzi 24.
    Papadopoulos, Konstantinos
    Department of Physics, Chalmers University of Technology, SE-412 96, Göteborg, Sweden.
    Medarde, Marisa
    Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland.
    Lyu, Jike
    Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland.
    Klein, Yannick Maximilian
    Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland.
    Minelli, Arianna
    Inorganic Chemistry Laboratory, University of Oxford, Oxford, OX1 3QR, UK.
    Hossain, Zakir
    Department of Physics, Indian Institute of Technology, Kanpur, Uttar Pradesh, 208016, India, Uttar Pradesh.
    Thamizhavel, Arumugam
    DCMPMS, Tata Institute of Fundamental Research, Mumbai, Maharashtra, 400005, India, Maharashtra.
    Lefmann, Kim
    Nanoscience Center, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen, Denmark, Universitetsparken 5.
    Ivashko, Oleh
    Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany, Notkestr. 85.
    von Zimmermann, Martin
    Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany, Notkestr. 85.
    Sassa, Yasmine
    Department of Physics, Chalmers University of Technology, SE-412 96, Göteborg, Sweden.
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Multiple unconventional charge density wave transitions in LaPt2Si2 superconductor clarified with high-energy X-ray diffraction2023In: Communications Materials, E-ISSN 2662-4443, Vol. 4, no 1, article id 77Article in journal (Refereed)
    Abstract [en]

    The quasi-2D platinum-based rare earth intermetallic LaPt2Si2 has attracted attention as it exhibits strong interplay between charge density wave order and superconductivity. However, most of the results reported on this material come from theoretical calculations, preliminary bulk investigations and powder samples, which makes it difficult to uniquely determine the temperature evolution of its crystal structure and, consequently, of its charge density wave transition. Therefore, the published literature around LaPt2Si2 is often controversial. Here, by means of high-resolution synchrotron X-ray diffraction data, we clarify some of the poorly or partially understood aspects of the physics of LaPt2Si2. In particular, we resolve the complex evolution of its crystal structure and superstructures, identifying the temperature dependence of multiple density wave transitions in good quality LaPt2Si2 single crystals. According to our findings, on cooling from room temperature LaPt2Si2 undergoes a series of subtle structural transitions which can be summarised as follows: second order commensurate tetragonal (P4/n m m)-to-incommensurate structure followed by a first order incommensurate-to-commensurate orthorhombic (P m m n) transition and then a first order commensurate orthorhombic (P m m n)-to-commensurate tetragonal (P4/n m m). The structural transitions are accompanied by both incommensurate and commensurate superstructural distortions of the lattice. The observed behavior is compatible with discommensuration of the CDW in this material.

  • 27.
    Nocerino, Elisabetta
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Sassa, Yasmine
    Suter, Andreas
    Forslund, Ola Kenji
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Andreica, Daniel
    Nozaki, Hiroshi
    Umegaki, Izumi
    Imazeki, Daisuke
    Nishio, Kazunori
    Hitosugi, Taro
    Prokscha, Thomas
    Salman, Zaher
    Sugiyama, Jun
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Superconducting Properties of the Thin Film LiTi2O4 Spinel Compound Investigated by Low-Energy µ+SRManuscript (preprint) (Other academic)
  • 28.
    Nocerino, Elisabetta
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Stuhr, U.
    Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
    San Lorenzo, I.
    Nanoscience Center, Niels Bohr Institute, University of Copenhagen, Noerre Alle 59, DK-2100 Copenhagen O, Denmark, Nørre Allé 59; Department of Applied Science and Technology, Politecnico di Torino, corso Duca degli abruzzi 24 10129 Torino, Italy.
    Mazza, F.
    Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstrasse 8-10, 1040 Vienna, Austria, Wiedner Hauptstraße 8–10.
    Mazzone, D. G.
    Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
    Hellsvik, Johan
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. KTH, School of Electrical Engineering and Computer Science (EECS), Centres, Centre for High Performance Computing, PDC.
    Hasegawa, S.
    Neutron Science Laboratory, Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
    Asai, S.
    Neutron Science Laboratory, Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
    Masuda, T.
    Neutron Science Laboratory, Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan, Chiba; Trans-scale Quantum Science Institute, The University of Tokyo, Tokyo 113-0033, Japan; Institute of Materials Structure Science, High Energy Accelerator Research Organization, Ibaraki 305-0801, Japan.
    Itoh, S.
    Institute of Materials Structure Science, High Energy Accelerator Research Organization, Ibaraki 305-0801, Japan.
    Minelli, A.
    Inorganic Chemistry Laboratory, University of Oxford, Oxford OX1 3QR, United Kingdom.
    Hossain, Z.
    Department of Physics, Indian Institute of Technology, Kanpur 208016, India.
    Thamizhavel, A.
    DCMPMS, Tata Institute of Fundamental Research, Mumbai 400005, India.
    Lefmann, K.
    Nanoscience Center, Niels Bohr Institute, University of Copenhagen, Noerre Alle 59, DK-2100 Copenhagen O, Denmark.
    Sassa, Y.
    Department of Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Q-dependent electron-phonon coupling induced phonon softening and non-conventional critical behavior in the CDW superconductor LaPt2Si22023In: Journal of Science: Advanced Materials and Devices, ISSN 2468-2284, Vol. 8, no 4, article id 100621Article in journal (Refereed)
    Abstract [en]

    This paper reports the first experimental observation of phonons and their softening on single crystalline LaPt2Si2 via inelastic neutron scattering. From the temperature dependence of the phonon frequency in close proximity to the charge density wave (CDW) q-vector, we obtain a CDW transition temperature of TCDW = 230 K and a critical exponent β = 0.28 ± 0.03. This value is suggestive of a non-conventional critical behavior for the CDW phase transition in LaPt2Si2, compatible with a scenario of CDW discommensuration (DC). The DC would be caused by the existence of two CDWs in this material, propagating separately in the non equivalent (Si1–Pt2–Si1) and (Pt1–Si2–Pt1) layers, respectively, with transition temperatures TCDW−1 = 230 K and TCDW−2 = 110 K. A strong q-dependence of the electron-phonon coupling has been identified as the driving mechanism for the CDW transition at TCDW−1 = 230 K while a CDW with 3-dimensional character, and Fermi surface quasi-nesting as a driving mechanism, is suggested for the transition at TCDW−2 = 110 K. Our results clarify some aspects of the CDW transition in LaPt2Si2 which have been so far misinterpreted by both theoretical predictions and experimental observations and give direct insight into its actual temperature dependence.

  • 29.
    Nocerino, Elisabetta
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Stuhr, Uwe
    San Lorenzo, Irene
    Mazza, Federico
    Mazzone, Daniel
    Hellsvik, Johan
    KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory.
    Hasegawa, Shunsuke
    Asai, Shinichiro
    Masuda, Takatsugu
    Minelli, Arianna
    Hossain, Zakir
    Thamizhavel, Arumugam
    Lefmann, Kim
    Sassa, Yasmine
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Q-dependent Phonon Renormalization and Non-Conventional Critical Behavior in the CDW Superconductor LaPt2Si2Manuscript (preprint) (Other academic)
  • 30.
    Nocerino, Elisabetta
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Sugiyama, Jun
    Brewer, Jess
    Forslund, Ola Kenji
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Umegaki, Izumi
    Nozaki, Hiroshi
    Kobayashi, Shintaro
    Yoshimura, Kazuyoshi
    Sassa, Yasmine
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Cr-Cr Distance and Magnetism in the Novel Triangular Lattice Antiferromangets LiCrSe2, LiCrTe2 and NaCrTe2: a systematic µ+SR studyManuscript (preprint) (Other academic)
  • 31.
    Nocerino, Elisabetta
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Witteveen, C.
    Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211, Geneva 4, Switzerland, 24 Quai Ernest-Ansermet; Department of Physics, University of Zürich, Winterthurerstr. 190, 8057, Zurich, Switzerland, Winterthurerstr. 190.
    Kobayashi, S.
    Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo, 679-5198, Japan, 1-1-1 Kouto.
    Forslund, Ola Kenji
    Department of Physics, Chalmers University of Technology, 412 96, Göteborg, Sweden.
    Matsubara, Nami
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Zubayer, A.
    Department of Physics, Chemistry and Biology (IFM), Linköping University, 581 83, Linköping, Sweden.
    Mazza, F.
    Insitute of Solid State Physics, TU Wien, Wiedner Haupstraße 8-10, 1040, Vienna, Austria, Wiedner Haupstraße 8-10.
    Kawaguchi, S.
    Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo, 679-5198, Japan, 1-1-1 Kouto.
    Hoshikawa, A.
    Frontier Research Center for Applied Atomic Sciences, Ibaraki University, 162-1 Shirakata, Tokai, Ibaraki, 319-1106, Japan, 162-1 Shirakata, Ibaraki.
    Umegaki, I.
    Muon Science Laboratory, Institute of Materials Structure Science, KEK, Tokai, Ibaraki, 319-1106, Japan, Ibaraki.
    Sugiyama, J.
    Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki, 319-1106, Japan, Ibaraki; Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan, Ibaraki.
    Yoshimura, K.
    Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan.
    Sassa, Y.
    Department of Physics, Chalmers University of Technology, 412 96, Göteborg, Sweden.
    von Rohr, F. O.
    Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211, Geneva 4, Switzerland, 24 Quai Ernest-Ansermet.
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Nuclear and magnetic spin structure of the antiferromagnetic triangular lattice compound LiCrTe2 investigated by μ+SR, neutron and X-ray diffraction2022In: Scientific Reports, E-ISSN 2045-2322, Vol. 12, no 1, article id 21657Article in journal (Refereed)
    Abstract [en]

    Two-dimensional (2D) triangular lattice antiferromagnets (2D-TLA) often manifest intriguing physical and technological properties, due to the strong interplay between lattice geometry and electronic properties. The recently synthesized 2-dimensional transition metal dichalcogenide LiCrTe2, being a 2D-TLA, enriched the range of materials which can present such properties. In this work, muon spin rotation (μ+SR) and neutron powder diffraction (NPD) have been utilized to reveal the true magnetic nature and ground state of LiCrTe2. From high-resolution NPD the magnetic spin order at base-temperature is not, as previously suggested, helical, but rather collinear antiferromagnetic (AFM) with ferromagnetic (FM) spin coupling within the ab-plane and AFM coupling along the c-axis. The value if the ordered magnetic Cr moment is established as μCr=2.36μB. From detailed μ+SR measurements we observe an AFM ordering temperature TN≈ 125 K. This value is remarkably higher than the one previously reported by magnetic bulk measurements. From μ+SR we are able to extract the magnetic order parameter, whose critical exponent allows us to categorize LiCrTe2 in the 3D Heisenberg AFM universality class. Finally, by combining our magnetic studies with high-resolution synchrotron X-ray diffraction (XRD), we find a clear coupling between the nuclear and magnetic spin lattices. This suggests the possibility for a strong magnon–phonon coupling, similar to what has been previously observed in the closely related compound LiCrO2.

  • 32.
    Nocerino, Elisabetta
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Witteveen, Catherine
    Kobayashi, Shintaro
    Forslund, Ola Kenji
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Matsubara, Nami
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Zubayer, Anton
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Mazza, Federico
    Kawaguchi, Shogo
    Hoshikawa, Akinori
    Umegaki, Izumi
    Sugiyama, Jun
    Yoshimura, Kazuyoshi
    Sassa, Yasmine
    von Rohr, Fabian
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Nuclear and magnetic spin structure of the antiferromagnetic triangular lattice compound LiCrTe2 investigated by µ+SR, neutron and X-ray diffractionManuscript (preprint) (Other academic)
    Abstract [en]

    Two−dimensional (2D) triangular lattices antiferromagnets (2D−TLA) often manifest intriguing physical and technological properties, due to the strong interplay between lattice geometry and electronic properties. The recently synthesized 2−dimensional transition metal dichalcogenide LiCrTe2, being a 2D−TLA, enriched the range of materials which can present such properties. In this work, muon spin rotation (μ+SR) and neutron powder diffraction (NPD) have been utilized to reveal the true magnetic nature and ground state of LiCrTe2. From high−resolution NPD the magnetic spin order at base−temperature is not, as previously suggested, helical, but rather collinear antiferromagnetic (AFM) with ferromagnetic (FM) spin coupling within the ab−plane and AFM coupling along the c−axis. The ordered magnetic Cr moment is established as μCr= 2.36 μB. From detailed μ+SR measurements we observe an AFM ordering temperature TN≈ 125 K. This value is remarkably higher than the one previously reported by magnetic bulk measurements. From μ+SR we are able to extract the magnetic order parameter, whose critical exponent allows us to categorize LiCrTe2 in the 3D Heisenberg AFM universality class. Finally, by combining our magnetic studies with high−resolution synchrotron X−ray diffraction (XRD), we find a clear coupling between the nuclear and magnetic spin lattices. This suggests the possibility for a strong magnon−phonon coupling, similar to what has been previously observed in the closely related compound LiCrO2.

  • 33.
    Ohishi, Kazuki
    et al.
    Comprehens Res Org Sci & Soc CROSS, Neutron Sci & Technol Ctr, Tokai, Ibaraki 3191106, Japan..
    Ohta, Hiroto
    Doshisha Univ, Fac Sci & Engn, I-3 Tatara Miyakodani, Kyoto 6100321, Japan..
    Kato, Yusuke
    Tokyo Univ Agr & Technol, Dept Appl Phys, 2-24-16 Naka Cho, Koganei, Tokyo 1848588, Japan..
    Katori, Hiroko Aruga
    Tokyo Univ Agr & Technol, Dept Appl Phys, 2-24-16 Naka Cho, Koganei, Tokyo 1848588, Japan..
    Forslund, Ola Kenji
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Matsubara, Nami
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Konstantinos, Papadopoulos
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Johansson, Fredrik
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Applied Physical Chemistry. Angstromlaboratoriet, Dept Phys & Astron, SE-75120 Uppsala, Sweden..
    Sassa, Yasmine
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Hitti, Bassam
    TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada..
    Arseneau, Donald
    TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada..
    Morris, Gerald D.
    TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada..
    Brewer, Jess H.
    Univ British Columbia, Dept Phys Astron, Vancouver, BC V6T IZ1, Canada..
    Sugiyama, Jun
    Comprehens Res Org Sci & Soc CROSS, Neutron Sci & Technol Ctr, Tokai, Ibaraki 3191106, Japan..
    The internal magnetic field in a ferromagnetic compound Y2Co12P72023In: Proceedings 15th International Conference on Muon Spin Rotation, Relaxation and Resonance (SR) / [ed] Prando, G Pratt, F, IOP Publishing , 2023, Vol. 2462, article id 012008Conference paper (Refereed)
    Abstract [en]

    The internal magnetic field in a ferromagnetic compound, Y2Co12P7 with T-C = 150 K, was studied with mu(+) SR using a powder sample down to 2 K. The wTF-mu(+) SR measurements revealed the presence of a sharp magnetic transition at T-C = 151 K, and the ZF-mu(+) SR measurements clarified the formation of static magnetic order below T-C. The presence of two muon spin precession signals in the ZF-mu(+) SR spectrum below TC indicates the existence of the two different muon sites in the lattice. By considering the muon sites and local spin densities at the muon sites predicted with DFT calculations, the ordered magnetic moments of Co were successfully determined.

  • 34.
    Palm, Rasmus
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Tuul, Kenneth
    Univ Tartu, Inst Chem, Ravila 14a, EE-50411 Tartu, Estonia..
    Elson, Frank
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Forslund, Ola Kenji
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Hansen, Thomas C.
    Inst Laue Langevin, 71 Ave Martyrs,CS 20156, F-38042 Grenoble 9, France..
    Aruvali, Jaan
    Univ Tartu, Inst Ecol & Earth Sci, Vanemuise 46, EE-51014 Tartu, Estonia..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    In situ neutron diffraction of NaAlD4/carbon black composites during decomposition/deuteration cycles and the effect of carbon on phase segregation2022In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 47, no 80, p. 34195-34204Article in journal (Refereed)
    Abstract [en]

    The influence on the decomposition and reforming of the hydrogen storage material NaAlH4 by adding relatively low amounts of mesoporous carbon black is investigated with in situ diffraction. A 60:40 NaAlH4/carbon black composite is prepared via ball milling and characterised ex situ via X-ray diffraction, gas adsorption, temperature-programmed decomposition, and dehydrogenation/hydrogenation cycling methods. The prepared composite is deuterated, and the crystalline phase composition is determined with in situ neutron powder diffraction method during multiple decomposition/deuteration cycles. Changes in the crystalline phase composition start slightly below the melting temperature of the pristine alanate, whereas the release of deuterium starts at considerably lower temperatures. The decomposition of Na3AlD6 to NaD is almost completely reversible at the applied low deuterium pressures of >= 2 MPa. Thus, the strong effect of even low concen-trations of a mesoporous carbon black on the capability to store H2 reversibly is showcased and analysed in-depth.

  • 35.
    Papadopoulos, Konstantinos
    et al.
    Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden..
    Forslund, Ola Kenji
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics. Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden..
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Johansson, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics. Uppsala Univ, Div Mol & Condensed Matter Phys, S-75237 Uppsala, Sweden.;Sorbonne Univ, Inst Nanosci Paris, UMR CNRS 7588, F-75005 Paris, France..
    Simutis, Gediminas
    Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden.;Paul Scherrer Inst, Lab Neutron & Muon Instrumentat, CH-5232 Villigen, Switzerland..
    Matsubara, Nami
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Morris, Gerald
    TRIUMF, 4004 Wesbrook Mall, Vancouver, BC 623, Canada..
    Hitti, Bassam
    TRIUMF, 4004 Wesbrook Mall, Vancouver, BC 623, Canada..
    Arseneau, Donald
    TRIUMF, 4004 Wesbrook Mall, Vancouver, BC 623, Canada..
    Svedlindh, Peter
    Uppsala Univ, Dept Mat Sci & Engn, S-75103 Uppsala, Sweden..
    Medarde, Marisa
    Paul Scherrer Inst, Lab Multiscale Mat Expt, CH-5232 Villigen, Switzerland..
    Andreica, Daniel
    Babes Bolyai Univ, Fac Phys, Cluj Napoca 400084, Cluj, Romania..
    Orain, Jean-Christophe
    Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland..
    Pomjakushin, Vladimir
    Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland..
    Börjesson, Lars
    Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden..
    Sugiyama, Jun
    Uppsala Univ, Div Mol & Condensed Matter Phys, S-75237 Uppsala, Sweden.;Comprehens Res Org Sci & Soc CROSS, Neutron Sci & Technol Ctr, Tokai, Ibaraki 3191106, Japan..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Sassa, Yasmine
    Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden..
    Influence of the magnetic sublattices in the double perovskite LaCaNiReO62022In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 106, no 21, article id 214410Article in journal (Refereed)
    Abstract [en]

    The magnetism of double perovskites is a complex phenomenon, determined from intra- or interatomic magnetic moment interactions, and strongly influenced by geometry. We take advantage of the complementary length and timescales of the muon spin rotation, relaxation, and resonance (mu+SR) microscopic technique and bulk ac/dc magnetic susceptibility measurements to study the magnetic phases of the LaCaNiReO6 double perovskite. As a result, we are able to discern and report ferrimagnetic ordering below TC = 102 K and the formation of different magnetic domains above TC. Between TC < T < 270 K, the following two magnetic environments appear, a dense spin region and a static-dilute spin region. The paramagnetic state is obtained only above T > 270 K. An evolution of the interaction between Ni and Re magnetic sublattices, in this geometrically frustrated fcc perovskite structure, is revealed as a function of temperature through the critical behavior and thermal evolution of microscopic and macroscopic physical quantities.

  • 36.
    Sugiyama, Jun
    et al.
    CROSS Neutron Sci & Technol Ctr, Tokai, Ibaraki 3191106, Japan.;Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan.;High Energy Accelerator Res Org KEK, Tokai, Ibaraki 3191106, Japan..
    Andreica, Daniel
    Babes Bolyai Univ, Fac Phys, Cluj Napoca 400084, Romania..
    Forslund, Ola Kenji
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Matsubara, Nami
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Sassa, Yasmine
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Guguchia, Zurab
    Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Psi, Switzerland..
    Khasanov, Rustem
    Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Psi, Switzerland..
    Pratt, Francis L.
    STFC Rutherford Appleton Lab, ISIS Pulsed Neutron & Muon Facil, Didcot OX11 0QX, Oxon, England..
    Nakamura, Hiroyuki
    Kyoto Univ, Dept Mat Sci & Engn, Kyoto 6068501, Japan..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Magnetic phase boundary of BaVS3 clarified with high-pressure mu+SR2020In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 101, no 17, article id 174403Article in journal (Refereed)
    Abstract [en]

    The magnetic nature of the quasi-one-dimensional BaVS3 has been studied as a function of temperature down to 0.25 K and pressure up to 1.97 GPa on a powder sample using the positive muon spin rotation and relaxation (mu(+) SR) technique. At ambient pressure, BaVS3 enters an incommensurate antiferromagnetic ordered state below the Neel temperature (T-N)31 K. T-N is almost constant as the pressure (p) increases from ambient pressure to 1.4 GPa, then T-N decreases rapidly for p > 1.4 GPa, and finally disappears at p similar to 1.8 GPa, above which a metallic phase is stabilized. Hence, T-N is found to be equivalent to the pressure-induced metal-insulator transition temperature (T-MI) at p > 1.4 GPa.

  • 37.
    Sugiyama, Jun
    et al.
    Comprehens Res Org Sci & Soc CROSS, Neutron Sci & Technol Ctr, Tokai, Ibaraki 3191106, Japan..
    Forslund, Ola K.
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Sassa, Yasmine
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Hillier, Adrian
    Harwell Oxford, STFC Rutherford Appleton Lab, ISIS Pulsed Neutron & Muon Facil, Didcot OX11 0QX, England..
    Ishida, Katsuhiko
    RIKEN, Meson Sci Lab, 2-1 Hirosawa, Wako, Saitama 3510198, Japan..
    Negative muon spin rotation and relaxation on superconducting MgB22023In: Proceedings 15th International Conference on Muon Spin Rotation, Relaxation and Resonance (SR) / [ed] Prando, G Pratt, F, IOP Publishing , 2023, Vol. 2462, article id 012059Conference paper (Refereed)
    Abstract [en]

    The internal nuclear magnetic field in a superconducting MgB2 powder sample was studied with a mu-SR technique. Although the past mu+SR study on MgB2 reported the appearance of a dynamic behavior even below T-c due to mu(+) diffusion, mu-SR shows a static behavior in the whole temperature range measured, as expected. The ZF-mu-SR spectra do not suggest any appearance of additional magnetic field below T-c within the experimental accuracy. Considering the small asymmetry of the mu-SR signal, it is a challenge to detect the appearance of an internal magnetic field below Tc caused by the time reversal symmetry breaking.

  • 38.
    Sugiyama, Jun
    et al.
    Comprehens Res Org Sci & Soc CROSS, Neutron Sci & Technol Ctr, Tokai, Ibaraki 3191106, Japan.;Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan.;High Energy Accelerator Res Org KEK, Tokai, Ibaraki 3191106, Japan..
    Forslund, Ola Kenji
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Matsubara, Nami
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Papadopoulos, Konstantinos
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Sassa, Yasmine
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Cottrell, Stephen P.
    STFC Rutherford Appleton Lab, ISIS Pulsed Neutron & Muon Facil, Harwell Oxford, Didcot OX11 0QX, Oxon, England..
    Hillier, Adrian D.
    STFC Rutherford Appleton Lab, ISIS Pulsed Neutron & Muon Facil, Harwell Oxford, Didcot OX11 0QX, Oxon, England..
    Ishida, Katsuhiko
    RIKEN, Meson Sci Lab, 2-1 Hirosawa, Wako, Saitama 3510198, Japan..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Brewer, Jess H.
    Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada.;TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada..
    Lithium diffusion in LiMnPO4 detected with mu +/- SR2020In: Physical Review Research, E-ISSN 2643-1564, Vol. 2, no 3, article id 033161Article in journal (Refereed)
    Abstract [en]

    Positive- and negative-muon spin rotation and relaxation (mu(+/-) SR) was first used to investigate fluctuations of nuclear magnetic fields in an olivine-type battery material, LiMnPO4, in order to clarify the diffusive species, namely, to distinguish between a mu(+) hopping among interstitial sites and Li+ ions diffusing in the LiMnPO4 lattice. Muon diffusion can only occur in mu+SR, because the implanted mu(-) forms a stable muonic atom at the lattice site, and therefore any change in linewidth measured with mu-SR must be due to Li+ diffusion. Since the two measurements exhibit a similar increase in the field fluctuation rate with temperature above 100 K, it is confirmed that Li+ ions are in fact diffusing. The diffusion coefficient of Li+ at 300 K and its activation energy were estimated to be 1.4(3) x 10(-10) cm(2)/s and 0.19(3) eV, respectively. Such combined mu(SR)-S-+/- measurements are thus shown to be a suitable tool for detecting ion diffusion in solid-state energy materials.

  • 39.
    Sugiyama, Jun
    et al.
    Comprehens Res Org Sci & Soc CROSS, Neutron Sci & Technol Ctr, Tokai, Ibaraki 3191106, Japan.;Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan.;High Energy Accelerator Res Org KEK, Tokai, Ibaraki 3191106, Japan..
    Higemoto, Wataru
    Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan..
    Andreica, Daniel
    Babes Bolyai Univ, Fac Phys, Cluj Napoca 400084, Romania..
    Forslund, Ola Kenji
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Sassa, Yasmine
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Gupta, Ritu
    Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland..
    Khasanov, Rustem
    Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland..
    Ohta, Hiroto
    Kyoto Univ, Dept Mat Sci & Engn, Kyoto 6068501, Japan..
    Nakamura, Hiroyuki
    Kyoto Univ, Dept Mat Sci & Engn, Kyoto 6068501, Japan..
    Pressure dependence of ferromagnetic phase boundary in BaVSe3 studied with high-pressure mu+SR2021In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 103, no 10, article id 104418Article in journal (Refereed)
    Abstract [en]

    The magnetic nature of a quasi-one-dimensional compound, BaVSe3, has been investigated with positive muon spin rotation and relaxation (mu+SR) measurements at ambient and high pressures. At ambient pressure, the mu+SR spectrum recorded under zero external magnetic field exhibited a clear oscillation below the Curie temperature (T-C similar to 41 K) due to the formation of quasistatic ferromagnetic order. The oscillation consisted of two different muon spin precession signals, indicating the presence of two magnetically different muon sites in the lattice. However, the two precession frequencies, which correspond to the internal magnetic fields at the two muon sites, could not be adequately explained with relatively simple ferromagnetic structures using the muon sites predicted by density functional theory calculations. The detailed analysis of the internal magnetic field suggested that the V moments align ferromagnetically along the c axis but slightly canted toward the a axis by 28 degrees that is coupled antiferromagnetically. The ordered V moment (M-v) is estimated as (0.59, 0, 1.11) mu(B). As pressure increased from ambient pressure, T-C was found to decrease slightly up to about 1.5 GPa, at which point T-C started to increase rapidly with the further increase of the pressure. Based on a strong ferromagnetic interaction along the c axis, the high-pressure mu+SR result revealed that there are two magnetic interactions in the ab plane; one is an antiferromagnetic interaction that is enhanced with pressure, mainly at pressures below 1.5 GPa, while the other is a ferromagnetic interaction that becomes predominant at pressures above 1.5 GPa.

  • 40.
    Sugiyama, Jun
    et al.
    Comprehens Res Org Sci & Soc CROSS, Neutron Sci & Technol Ctr, Tokai, Ibaraki 3191106, Japan..
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Forslund, Ola Kenji
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Sassa, Yasmine
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Kobayashi, Shigeru
    Tokyo Inst Technol, Sch Mat & Chem Technol, Tokyo 1528552, Japan..
    Nishio, Kazunori
    Tokyo Inst Technol, Sch Mat & Chem Technol, Tokyo 1528552, Japan..
    Hitosugi, Taro
    Tokyo Inst Technol, Sch Mat & Chem Technol, Tokyo 1528552, Japan..
    Suter, Andreas
    Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland..
    Prokscha, Thomas
    Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland..
    Search for a space charge layer in thin film battery materials with low-energy muons2023In: Proceedings 15th International Conference on Muon Spin Rotation, Relaxation and Resonance (SR) / [ed] Prando, G Pratt, F, IOP Publishing , 2023, Vol. 2462, article id 012046Conference paper (Refereed)
    Abstract [en]

    In an all solid state Li-ion battery, it is crucial to reduce ionic resistivity at the interface between the electrode and the electrolyte in order to enhance Li+ mobility across the interface. Recent first principles calculations predict the presence of a space-charge layer (SCL) at the interface due to the difference in the Li+ chemical potential at the interface between two different materials, as in the metal-semiconductor junction in electronic devices. However, the presence of SCL has never been experimentally observed. Our first attempt in a fresh multilayer sample, Cu(10 nm)/Li3PO4(50 nm)/LiCoO2(100 nm) on a sapphire substrate, with low-energy mu+SR (LE mu+SR) revealed a gradual change in the nuclear magnetic field distribution width as a function of implantation depth even across the interface between Li3PO4 and LiCoO2. This implies that the change in the field distribution width at SCL of the sample is too small to be detected by LE mu+SR.

  • 41.
    Sugiyama, Jun
    et al.
    Comprehens Res Org Sci & Soc CROSS, Neutron Sci & Technol Ctr, Tokai, Ibaraki 3191106, Japan.;Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan.;High Energy Accelerator Res Org KEK, Tokai, Ibaraki 3191106, Japan..
    Umegaki, Izumi
    Toyota Cent Res & Dev Labs Inc, Nagakute, Aichi 4801192, Japan..
    Takeshita, Soshi
    High Energy Accelerator Res Org KEK, Tokai, Ibaraki 3191106, Japan..
    Sakurai, Hiroya
    Natl Inst Mat Sci NIMS, Namiki 1-1, Tsukuba, Ibaraki 3050044, Japan..
    Nishimura, Shoichiro
    High Energy Accelerator Res Org KEK, Tokai, Ibaraki 3191106, Japan..
    Forslund, Ola Kenji
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Nocerino, Elisabetta
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Matsubara, Nami
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Nakano, Takehito
    Ibaraki Univ, Grad Sch Sci & Engn, Inst Quantum Beam Sci, Mito, Ibaraki 3108512, Japan..
    Yamauchi, Ichihiro
    Saga Univ, Grad Sch Sci & Engn, Dept Phys, Saga 8408502, Japan..
    Ninomiya, Kazuhiko
    Osaka Univ, Grad Sch Sci, Dept Chem, Toyonaka, Osaka 5600043, Japan..
    Kubo, M. Kenya
    Int Christian Univ, Coll Liberal Arts, Mitaka, Tokyo 1818585, Japan..
    Shimomura, Koichiro
    High Energy Accelerator Res Org KEK, Tokai, Ibaraki 3191106, Japan..
    Nuclear magnetic field in Na0.7CoO2 detected with mu-SR2020In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 102, no 14, article id 144431Article in journal (Refereed)
    Abstract [en]

    The internal magnetic field in a sodium battery compound, i.e., the paramagnet Na0.7CoO2, was investigated with negative muon spin rotation and relaxation (mu-SR), and the result was compared with the results previously obtained with mu+SR. The majority of implanted mu(-) is captured on an oxygen nucleus, while mu(+) locates an interstitial site. Therefore, a mu(+/-) SR work provides information on the internal magnetic field, which is formed by nuclear magnetic moments of Na-23 and Co-59, from the two different viewpoints. Besides a slight decrease in the field distribution width (Delta) around 300 K, the nuclear magnetic field detected with mu- SR was found to be almost static and temperature independent up to 400 K, even though Na ions are known to start to diffuse above 290 K based on mu(+) SR, Na-NMR, neutron scattering, and electrochemical measurements. Such a discrepancy is caused by the fact that the Na contribution to Delta is only about 3% at the O site whereas it is about 13% at the interstitial site, where the mu(+) is presumably located.

  • 42.
    Witteveen, Catherine
    et al.
    Univ Geneva, Dept Quantum Matter Phys, Quai Ernest Ansermet 24, CH-1211 Geneva, Switzerland.;Univ Zurich, Dept Phys, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
    Nocerino, Elisabetta
    Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland..
    Lopez-Paz, Sara A.
    Univ Geneva, Dept Quantum Matter Phys, Quai Ernest Ansermet 24, CH-1211 Geneva, Switzerland..
    Jeschke, Harald O.
    Okayama Univ, Res Inst Interdisciplinary Sci, Okayama 7008530, Japan..
    Pomjakushin, Vladimir Y.
    Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    von Rohr, Fabian O.
    Univ Geneva, Dept Quantum Matter Phys, Quai Ernest Ansermet 24, CH-1211 Geneva, Switzerland..
    Synthesis and anisotropic magnetic properties of LiCrTe2 single crystals with a triangular-lattice antiferromagnetic structure2023In: Journal of Physics: Materials, E-ISSN 2515-7639, Vol. 6, no 3, article id 035001Article in journal (Refereed)
    Abstract [en]

    We report on the synthesis of LiCrTe2 single crystals and on their anisotropic magnetic properties. We have obtained these single crystals by employing a Te/Li-flux synthesis method. We find LiCrTe2 to crystallize in a TlCdS2 -type structure with cell parameters of a = 3.9512(5) angstrom and c = 6.6196(7) angstrom at T = 175 K. The content of lithium in these crystals was determined to be neary stoichiometric by means of neutron diffraction. We find a pronounced magnetic transition at T-N(ab) = 144 K and T-N

1 - 42 of 42
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