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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.
    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.

  • 5.
    Kanyolo, Godwill Mbiti
    et al.
    Univ Electrocommun, Dept Engn Sci, 1-5-1 Chofugaoka, Chofu, Tokyo 1828585, Japan..
    Masese, Titus
    Kyoto Univ, Chem Energy Mat Open Innovat Lab ChEMOIL, AIST, Sakyo Ku, Kyoto 6068501, Japan.;Natl Inst Adv Ind Sci & Technol, Res Inst Electrochem Energy, 1-8-31 Midorigaoka, Ikeda, Osaka 5638577, Japan..
    Matsubara, Nami
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Chen, Chih-Yao
    Kyoto Univ, Chem Energy Mat Open Innovat Lab ChEMOIL, AIST, Sakyo Ku, Kyoto 6068501, Japan..
    Rizell, Josef
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Huang, Zhen-Dong
    Nanjing Univ Posts & Telecommun NUPT, Key Lab Organ Elect & Informat Displays, Nanjing 210023, Peoples R China.;Nanjing Univ Posts & Telecommun NUPT, Inst Adv Mat IAM, Nanjing 210023, Peoples R China..
    Sassa, Yasmine
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Senoh, Hiroshi
    Natl Inst Adv Ind Sci & Technol, Res Inst Electrochem Energy, 1-8-31 Midorigaoka, Ikeda, Osaka 5638577, Japan..
    Matsumoto, Hajime
    Natl Inst Adv Ind Sci & Technol, Res Inst Electrochem Energy, 1-8-31 Midorigaoka, Ikeda, Osaka 5638577, Japan..
    Honeycomb layered oxides: structure, energy storage, transport, topology and relevant insights2021In: Chemical Society Reviews, ISSN 0306-0012, E-ISSN 1460-4744, Vol. 50, no 6, p. 3990-4030Article, review/survey (Refereed)
    Abstract [en]

    The advent of nanotechnology has hurtled the discovery and development of nanostructured materials with stellar chemical and physical functionalities in a bid to address issues in energy, environment, telecommunications and healthcare. In this quest, a class of two-dimensional layered materials consisting of alkali or coinage metal atoms sandwiched between slabs exclusively made of transition metal and chalcogen (or pnictogen) atoms arranged in a honeycomb fashion have emerged as materials exhibiting fascinatingly rich crystal chemistry, high-voltage electrochemistry, fast cation diffusion besides playing host to varied exotic electromagnetic and topological phenomena. Currently, with a niche application in energy storage as high-voltage materials, this class of honeycomb layered oxides serves as ideal pedagogical exemplars of the innumerable capabilities of nanomaterials drawing immense interest in multiple fields ranging from materials science, solid-state chemistry, electrochemistry and condensed matter physics. In this review, we delineate the relevant chemistry and physics of honeycomb layered oxides, and discuss their functionalities for tunable electrochemistry, superfast ionic conduction, electromagnetism and topology. Moreover, we elucidate the unexplored albeit vastly promising crystal chemistry space whilst outlining effective ways to identify regions within this compositional space, particularly where interesting electromagnetic and topological properties could be lurking within the aforementioned alkali and coinage-metal honeycomb layered oxide structures. We conclude by pointing towards possible future research directions, particularly the prospective realisation of Kitaev-Heisenberg-Dzyaloshinskii-Moriya interactions with single crystals and Floquet theory in closely-related honeycomb layered oxide materials.

  • 6.
    Koppel, Miriam
    et al.
    Univ Tartu, Inst Chem, Ravila 14a, EE-50411 Tartu, Estonia..
    Palm, Rasmus
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Harmas, Riinu
    Univ Tartu, Inst Chem, Ravila 14a, EE-50411 Tartu, Estonia..
    Russina, Margarita
    Helmholtz Zentrum Berlin Mat & Energie, Hahn Meitner Pl 1, D-14109 Berlin, Germany..
    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.
    Grzimek, Veronika
    Helmholtz Zentrum Berlin Mat & Energie, Hahn Meitner Pl 1, D-14109 Berlin, Germany..
    Paalo, Maarja
    Univ Tartu, Inst Chem, Ravila 14a, EE-50411 Tartu, Estonia..
    Aruvali, Jaan
    Univ Tartu, Dept Geol, Ravila 14a, EE-50411 Tartu, Estonia..
    Romann, Tavo
    Univ Tartu, Inst Chem, Ravila 14a, EE-50411 Tartu, Estonia..
    Oll, Ove
    Univ Tartu, Inst Chem, Ravila 14a, EE-50411 Tartu, Estonia..
    Lust, Enn
    Univ Tartu, Inst Chem, Ravila 14a, EE-50411 Tartu, Estonia..
    In situ observation of pressure modulated reversible structural changes in the graphitic domains of carbide-derived carbons2021In: Carbon, ISSN 0008-6223, E-ISSN 1873-3891, Vol. 174, p. 190-200Article in journal (Refereed)
    Abstract [en]

    Carbons are important in a multitude of applications, and thus, the reversible control of carbon structures is of high interest. Here we report the reversible formation of graphitic structures with three distinct interlayer distances in case of two carbide-derived carbons (CDCs) loaded under hydrogen pressure observed with in situ neutron scattering methods. The formation of these graphitic structures determined with in situ neutron diffraction is brought forth by the confinement of H-2 in the porous structure when the temperature, T, is increased from T = 20 K-50 K under H-2 loading from 68 mbar to 10 bar. The confinement of the desorbing H-2 causes the pressure to increase inside the CDC structure and this increase of pressure is the cause for the reversible formation of graphitic domains. The confinement of H-2 at T = 50 K is possible due to the presence of ultramicropores and suitable curved carbon structures. The three distinct formed graphitic domains correspond to a highly pressurized, conventional highly ordered graphitic, and disoriented graphitic domains with possible H-2/H intercalation. In situ quasi-elastic neutron scattering and gas adsorption methods are used to determine the H-2 transport properties and interactions with the CDCs.

  • 7.
    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.

  • 8.
    Maier, Stefan
    et al.
    Lab CRISMAT UMR 6508 CNRS ENSICAEN, 6 Blvd Marechal Juin, F-14050 Caen 04, France.;Rhein Westfal TH Aachen, Inst Phys IA, D-52074 Aachen, Germany..
    Gaultois, Michael W.
    Univ Liverpool, Dept Chem, Leverhulme Res Ctr Funct Mat Design, Mat Innovat Factory, 51 Oxford St, Liverpool L7 3NY, Merseyside, England..
    Matsubara, Nami
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics. Lab CRISMAT UMR 6508 CNRS ENSICAEN, 6 Blvd Marechal Juin, F-14050 Caen 04, France..
    Surta, Wesley
    Univ Liverpool, Dept Chem, Crown St, Liverpool L69 7ZD, Merseyside, England..
    Damay, Francoise
    Ctr Natl Rech Sci, Lab Leon Brillouin, CEA, CE Saclay, F-91191 Gif Sur Yvette, France..
    Hebert, Sylvie
    Lab CRISMAT UMR 6508 CNRS ENSICAEN, 6 Blvd Marechal Juin, F-14050 Caen 04, France..
    Hardy, Vincent
    Lab CRISMAT UMR 6508 CNRS ENSICAEN, 6 Blvd Marechal Juin, F-14050 Caen 04, France..
    Berthebaud, David
    Natl Inst Mat Sci, CNRS St Gobain NIMS, UMI 3629, Lab Innovat Key Mat & Struct Link, Tsukuba, Ibaraki 3050044, Japan..
    Gascoin, Franck
    Lab CRISMAT UMR 6508 CNRS ENSICAEN, 6 Blvd Marechal Juin, F-14050 Caen 04, France..
    Sb-5s lone pair dynamics and collinear magnetic ordering in Ba2FeSbSe52021In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 103, no 5, article id 054115Article in journal (Refereed)
    Abstract [en]

    Neutron diffraction and x-ray pair distribution function experiments were performed to investigate the magnetic and local crystal structures of Ba2FeSbSe5 and to compare them with the average (i.e., long range) structural model previously obtained by single-crystal x-ray diffraction. Changes in the local crystal structure (i.e., in the second coordination sphere) are observed upon cooling from 295 to 95 K, resulting in deviations from the average (i.e., long range) crystal structure. In this paper, we demonstrate that these observations cannot be explained by local or long-range magnetoelastic effects involving Fe-Fe correlations. Instead, we found that the observed differences between local and average crystal structure can be explained by Sb-5s lone pair dynamics. We also find that, below the Ned temperature (T-N = 58 K), the two distinct magnetic Fe3+ sites order collinearly, such that a combination of antiparallel and parallel spin arrangements along the b axis results. The nearest-neighbor arrangement (J(1) = 6 angstrom) is fully antiferromagnetic, while next-nearest-neighbor interactions are ferromagnetic in nature.

  • 9.
    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.

  • 10.
    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.

  • 11.
    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.

  • 12.
    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).

  • 13.
    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)
  • 14.
    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

  • 15.
    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. 

  • 16.
    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.

  • 17.
    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.

  • 18.
    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)
  • 19.
    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.

  • 20.
    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.

  • 21.
    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.

  • 22.
    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.

  • 23.
    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.

  • 24.
    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.

  • 25.
    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.

  • 26.
    Urushihara, Daisuke
    et al.
    Nagoya Inst Technol, Div Adv Ceram, Nagoya, Aichi 4668555, Japan..
    Asaka, Toru
    Nagoya Inst Technol, Div Adv Ceram, Nagoya, Aichi 4668555, Japan.;Nagoya Inst Technol, Frontier Res Inst Mat Sci, Nagoya, Aichi 4668555, Japan..
    Fukuda, Koichiro
    Nagoya Inst Technol, Div Adv Ceram, Nagoya, Aichi 4668555, Japan..
    Nakayama, Masanobu
    Nagoya Inst Technol, Div Adv Ceram, Nagoya, Aichi 4668555, Japan.;Nagoya Inst Technol, Frontier Res Inst Mat Sci, Nagoya, Aichi 4668555, Japan.;Natl Inst Mat Sci, MaDiS CMi2, Tsukuba, Ibaraki 3050047, Japan.;Kyoto Univ, Elements Strategy Initiat Catalysts & Batteries, Kyoto 6158245, Japan..
    Nakahira, Yuki
    Hiroshima Univ, Grad Sch Sci, Higashihiroshima, Hiroshima 7398526, Japan..
    Moriyoshi, Chikako
    Hiroshima Univ, Grad Sch Adv Sci & Engn, Higashihiroshima, Hiroshima 7398526, Japan..
    Kuroiwa, Yoshihiro
    Hiroshima Univ, Grad Sch Adv Sci & Engn, Higashihiroshima, Hiroshima 7398526, Japan..
    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.
    Månsson, Martin
    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..
    Ohishi, Kazuki
    Comprehens Res Org Sci & Soc CROSS, Neutron Sci & Technol Ctr, Tokai, Ibaraki 3191106, Japan..
    Sugiyama, Jun
    Comprehens Res Org Sci & Soc CROSS, Neutron Sci & Technol Ctr, Tokai, Ibaraki 3191106, Japan..
    Matsushita, Yoshitaka
    Natl Inst Mat Sci, Res Network & Facil Serv Div, Tsukuba, Ibaraki 3050047, Japan..
    Sakurai, Hiroya
    Natl Inst Mat Sci, Ctr Green Res Energy & Environm Mat, Tsukuba, Ibaraki 3050044, Japan..
    Structural Transition with a Sharp Change in the Electrical Resistivity and Spin-Orbit Mott Insulating State in a Rhenium Oxide, Sr3Re2O92021In: Inorganic Chemistry, ISSN 0020-1669, E-ISSN 1520-510X, Vol. 60, no 2, p. 508-515Article in journal (Refereed)
    Abstract [en]

    We report the successful synthesis, crystal structure, and electrical properties of Sr3Re2O9, which contains Re6+ with the 5d(1) configuration. This compound is isostructural with Ba3Re2O9 and shows a first-order structural phase transition at similar to 370 K. The low-temperature (LT) phase crystallizes in a hettotype structure of Ba3Re2O9, which is different from that of the LT phase of Sr3W2O9, suggesting that the electronic state of Re6+ plays an important role in determining the crystal structure of the LT phase. The structural transition is accompanied by a sharp change in the electrical resistivity. This is likely a metal-insulator transition, as suggested by the electronic band calculation and magnetic susceptibility. In the LT phase, the ReO6 octahedra are rotated in a pseudo-a(0)a(0)a(+) manner in Glazer notation, which corresponds to C-type orbital ordering. Paramagnetic dipole moments were confirmed to exist in the LT phase by muon spin rotation and relaxation measurements. However, the dipole moments shrink greatly because of the strong spin-orbit coupling in the Re ions. Thus, the electronic state of the LT phase corresponds to a Mott insulating state with strong spin-orbit interactions at the Re sites.

1 - 26 of 26
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