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  • 1.
    Alexander, Gerianne
    et al.
    Texas A&M Univ, Dept Psychol & Brain Sci, College Stn, TX USA..
    Allen, Roland E.
    Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA..
    Atala, Anthony
    Wake Forest Inst Regenerat Med, 391 Technol Way, Winston Salem, NC 27157 USA..
    Bowen, Warwick P.
    Univ Queensland, Sch Math & Phys, St Lucia, Qld 4072, Australia.;Univ Queensland, Australian Ctr Engn Quantum Syst, St Lucia, Qld 4072, Australia..
    Coley, Alan A.
    Dalhousie Univ, Dept Math & Stat, Halifax, NS B3H 4R2, Canada..
    Goodenough, John B.
    Univ Texas Austin, Cockrell Inst, Walker Dept Mech Engn, Austin, TX 78712 USA..
    Katsnelson, Mikhail, I
    Radboud Univ Nijmegen, Inst Mol & Mat, NL-6525 AJ Nijmegen, Netherlands..
    Koonin, Eugene, V
    Natl Lib Med, Natl Ctr Biotechnol Informat, Bethesda, MD 20894 USA..
    Krenn, Mario
    Austrian Acad Sci, Inst Quantum Opt & Quantum Informat IQOQI, Boltzmanngasse 3, A-1090 Vienna, Austria.;Univ Toronto, Dept Chem, Toronto, ON, Canada..
    Madsen, Lars S.
    Univ Queensland, Australian Ctr Engn Quantum Syst, St Lucia, Qld 4072, Australia..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Mauranyapin, Nicolas P.
    Univ Queensland, Sch Math & Phys, St Lucia, Qld 4072, Australia..
    Melvin, Art, I
    Austrian Acad Sci, Inst Quantum Opt & Quantum Informat IQOQI, Boltzmanngasse 3, A-1090 Vienna, Austria.;Univ Vienna, Fac Phys, Vienna Ctr Quantum Sci & Technol VCQ, Boltzmanngasse 5, A-1090 Vienna, Austria..
    Rasel, Ernst
    Inst Quantenopt, Welfengarten 1, D-30167 Hannover, Germany.;Leibnitz Univ Hannover, QUEST LFS DLR Inst Satellite Geodesy & Inertial S, Welfengarten 1, D-30167 Hannover, Germany..
    Reichl, Linda E.
    Univ Texas Austin, Ctr Complex Quantum Syst, Austin, TX 78712 USA.;Univ Texas Austin, Dept Phys, Austin, TX 78712 USA..
    Yampolskiy, Roman
    Univ Louisville, Duthie Ctr Engn, Dept Comp Engn & Comp Sci, Louisville, KY 40292 USA..
    Yasskin, Philip B.
    Texas A&M Univ, Dept Math, College Stn, TX 77843 USA..
    Zeilinger, Anton
    Austrian Acad Sci, Inst Quantum Opt & Quantum Informat IQOQI, Boltzmanngasse 3, A-1090 Vienna, Austria.;Univ Vienna, Fac Phys, Vienna Ctr Quantum Sci & Technol VCQ, Boltzmanngasse 5, A-1090 Vienna, Austria..
    Lidstrom, Suzy
    Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA..
    The sounds of science-a symphony for many instruments and voices2020In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. 95, no 6, article id 062501Article in journal (Refereed)
    Abstract [en]

    Sounds of Science is the first movement of a symphony for many (scientific) instruments and voices, united in celebration of the frontiers of science and intended for a general audience. John Goodenough, the maestro who transformed energy usage and technology through the invention of the lithium-ion battery, opens the programme, reflecting on the ultimate limits of battery technology. This applied theme continues through the subsequent pieces on energy-related topics-the sodium-ion battery and artificial fuels, by Martin Mansson-and the ultimate challenge for 3D printing, the eventual production of life, by Anthony Atala. A passage by Gerianne Alexander follows, contemplating a related issue: How might an artificially produced human being behave? Next comes a consideration of consciousness and free will by Roland Allen and Suzy Lidstrom. Further voices and new instruments enter as Warwick Bowen, Nicolas Mauranyapin and Lars Madsen discuss whether dynamical processes of single molecules might be observed in their native state. The exploitation of chaos in science and technology, applications of Bose-Einstein condensates and the significance of entropy follow in pieces by Linda Reichl, Ernst Rasel and Roland Allen, respectively. Mikhail Katsnelson and Eugene Koonin then discuss the potential generalisation of thermodynamic concepts in the context of biological evolution. Entering with the music of the cosmos, Philip Yasskin discusses whether we might be able to observe torsion in the geometry of the Universe. The crescendo comes with the crisis of singularities, their nature and whether they can be resolved through quantum effects, in the composition of Alan Coley. The climax is Mario Krenn, Art Melvin and Anton Zeilinger's consideration of how computer code can be autonomously surprising and creative. In a harmonious counterpoint, his 'Guidelines for considering AIs as coauthors', Roman Yampolskiy concludes that code is not yet able to take responsibility for coauthoring a paper. An interlude summarises a speech by Zdenek Papousek. In a subsequent movement, new themes emerge as we seek to comprehend how far we have travelled along the path to understanding, and speculate on where new physics might arise. Who would have imagined, 100 years ago, a global society permeated by smartphones and scientific instruments so sophisticated that genes can be modified and gravitational waves detected?

  • 2. Babkevich, P.
    et al.
    Jeong, M.
    Matsumoto, Y.
    Kovacevic, I.
    Finco, A.
    Toft-Petersen, R.
    Ritter, C.
    Månsson, Martin
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF. Ecole Polytech Fed Lausanne, ICMP, Lab Quantum Magnetism, Switzerland.
    Nakatsuji, S.
    Ronnow, H. M.
    Dimensional Reduction in Quantum Dipolar Antiferromagnets2016In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 116, no 19, article id 197202Article in journal (Refereed)
    Abstract [en]

    We report ac susceptibility, specific heat, and neutron scattering measurements on a dipolar-coupled antiferromagnet LiYbF4. For the thermal transition, the order-parameter critical exponent is found to be 0.20(1) and the specific-heat critical exponent -0.25(1). The exponents agree with the 2D XY/h(4) universality class despite the lack of apparent two-dimensionality in the structure. The order-parameter exponent for the quantum phase transitions is found to be 0.35(1) corresponding to (2 + 1)D. These results are in line with those found for LiErF4 which has the same crystal structure, but largely different T-N, crystal field environment and hyperfine interactions. Our results therefore experimentally establish that the dimensional reduction is universal to quantum dipolar antiferromagnets on a distorted diamond lattice.

  • 3.
    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.

  • 4.
    Benedek, Peter
    et al.
    Swiss Fed Inst Technol, Dept Informat Technol & Elect Engn, CH-8092 Zurich, Switzerland..
    Yazdani, Nuri
    Swiss Fed Inst Technol, Dept Informat Technol & Elect Engn, CH-8092 Zurich, Switzerland..
    Chen, Hungru
    Univ Bath, Dept Chem, Bath BA2 7AY, Avon, England..
    Wenzler, Nils
    Swiss Fed Inst Technol, Dept Informat Technol & Elect Engn, CH-8092 Zurich, Switzerland..
    Juranyi, Fanni
    Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Islam, M. Saiful
    Univ Bath, Dept Chem, Bath BA2 7AY, Avon, England..
    Wood, Vanessa C.
    Swiss Fed Inst Technol, Dept Informat Technol & Elect Engn, CH-8092 Zurich, Switzerland..
    Surface phonons of lithium ion battery active materials2019In: Sustainable Energy & Fuels, E-ISSN 2398-4902, Vol. 3, no 2, p. 508-513Article in journal (Refereed)
    Abstract [en]

    Surfaces of active materials are understood to play an important role in the performance and lifetime of lithium-ion batteries, but they remain poorly characterized and therefore cannot yet be systematically designed. Here, we combine inelastic neutron scattering and ab initio simulations to demonstrate that the structure of the surface of active materials differs from the interior of the particle. We use LiFePO4 (LFP) as a model system, and we find that carbon coating influences the Li-O bonding on the (010) LFP surface relative to the bulk. Our results highlight how coatings can be used to systematically engineer the vibrations of atoms at the surface of battery active materials, and thereby impact lithium ion transport, charge transfer, and surface reactivity.

  • 5.
    Brena, Barbara
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Palmgren, Pål
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Nilson, Katharina
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Yu, Shun
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Hennies, F.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Agnarsson, Björn
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Önsten, Anneli
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Månsson, Martin
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Göthelid, Mats
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    InSb-TiOPc interfaces: Band alignment, ordering and structure dependent HOMO splitting2009In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 603, no 20, p. 3160-3169Article in journal (Refereed)
    Abstract [en]

    Thin films of titanyl phthalocyanine (TiOPc) have been adsorbed on InSb(1 1 1) (3 x 3) and InSb(1 0 0) c(8 x 2) surfaces and studied with respect to their electronic structure using photoemission (PES), density functional theory (DFT) and scanning tunneling microscopy (STM). The interface chemical interaction is weak in both cases; no adsorbate induced surface band bending is observed and the energy level alignment across the interface is determined by the original position of the substrate Fermi level and the charge neutrality level of the molecule. Room temperature adsorption results in disordered films on both surfaces. The behaviors after annealing are different; on InSb(1 0 0) well-ordered molecular chains form along and on top of the In-rows, whereas on (1 1 1) no long range order is observed. The disorder leads to intermolecular interactions between the titanyl group and neighboring benzene rings leading to a split of TiOPc HOMO (highest occupied molecular orbital) by as much as 0.8 eV.

  • 6.
    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.

  • 7.
    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)
  • 8.
    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 DESY, Hamburg 22607, Germany.
    Mittal, Nitesh
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. KTH, School of Engineering Sciences (SCI), Mechanics.
    Ohm, Wiebke
    Deutsches Elektronen-Synchrotron (DESY), Notkestr. 85, 22607, Hamburg, Germany.
    Gensch, Marc
    Deutsches Elektronen-Synchrotron (DESY), Notkestr. 85, 22607, Hamburg, Germany.
    Kreuzer, Lucas P.
    Deutsches Elektronen-Synchrotron (DESY), Notkestr. 85, 22607, Hamburg, Germany.
    Körstgens, Volker
    Lehrstuhl für Funktionelle Materialien, Physik-Department, and ¶ Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universitat ̈ München, Garching 85748, Germany.
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Frielinghaus, Henrich
    Jülich Centre for Neutron Science at MLZ.
    Söderberg, Daniel
    KTH, Superseded Departments (pre-2005), Mechanics. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.
    Roth, Stephan V.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Biocomposites. Deutsches Elektronen-Synchrotron DESY, Hamburg 22607, Germany.
    Water-Induced Structural Rearrangements on the Nanoscale in Ultrathin Nanocellulose Films2019In: Macromolecules, ISSN 0024-9297, E-ISSN 1520-5835, Vol. 52, no 12, p. 4721-4728Article in journal (Refereed)
    Abstract [en]

    Many nanoscale biopolymer building blocks with defect-free molecular structure and exceptional mechanical properties have the potential to surpass the performance of existing fossil-based materials with respect to barrier properties, load-bearing substrates for advanced functionalities, as well as light-weight construction. Comprehension and control of performance variations of macroscopic biopolymer materials caused by humidity-driven structural changes at the nanoscale are imperative and challenging. A long-lasting challenge is the interaction with water molecules causing reversible changes in the intrinsic molecular structures that adversely affects the macroscale performance. Using in situ advanced X-ray and neutron scattering techniques, we reveal the structural rearrangements at the nanoscale in ultrathin nanocellulose films with humidity variations. These reversible rearrangements are then correlated with wettability that can be tuned. The results and methodology have general implications not only on the performance of cellulose-based materials but also for hierarchical materials fabricated with other organic and inorganic moisture-sensitive building blocks.

  • 9. Chang, J.
    et al.
    Månsson, Martin
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF.
    Pailhes, S.
    Claesson, Thomas
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF.
    Lipscombe, O. J.
    Hayden, S. M.
    Patthey, L.
    Tjernberg, Oscar
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF.
    Mesot, J.
    Anisotropic breakdown of Fermi liquid quasiparticle excitations in overdoped La2-xSrxCuO42013In: Nature Communications, E-ISSN 2041-1723, Vol. 4, p. 2559-Article in journal (Refereed)
    Abstract [en]

    High-temperature superconductivity emerges from an un-conventional metallic state. This has stimulated strong efforts to understand exactly how Fermi liquids breakdown and evolve into an un-conventional metal. A fundamental question is how Fermi liquid quasiparticle excitations break down in momentum space. Here we show, using angle-resolved photoemission spectroscopy, that the Fermi liquid quasiparticle excitations of the overdoped superconducting cuprate La1.77Sr0.23CuO4 is highly anisotropic in momentum space. The quasiparticle scattering and residue behave differently along the Fermi surface and hence the Kadowaki-Wood's relation is not obeyed. This kind of Fermi liquid breakdown may apply to a wide range of strongly correlated metal systems where spin fluctuations are present.

  • 10.
    Chang, Johan
    et al.
    Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institute, Villigen.
    Pailhés, Stephane
    Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institute, Villigen.
    Shi, Ming
    Swiss Light Source, Paul Scherrer Institute, Villigen.
    Månsson, Martin
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Claesson, Thomas
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Tjernberg, Oscar
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Voigt, Jörg
    Institute for Solid State Research, Forschungszentrum Jülich.
    Perez, V.
    Swiss Light Source, Paul Scherrer Institute, Villigen.
    Patthey, Luc
    Swiss Light Source, Paul Scherrer Institute, Villigen.
    Momono, Naoki
    Department of Physics, Hokkaido University, Sapporo.
    Oda, Migaku
    Department of Physics, Hokkaido University, Sapporo.
    Ido, Masayuki
    Department of Physics, Hokkaido University, Sapporo.
    Schnyder, A.
    Condensed Matter Theory Group, Villigen.
    Mudry, C.
    Condensed Matter Theory Group, Villigen.
    Mesot, Joël
    Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institute, Villigen.
    When low- and high-energy electronic responses meet in cuprate superconductors2007In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 75, no 22, p. 224508-Article in journal (Refereed)
    Abstract [en]

    The existence of coherent quasiparticles near the Fermi energy in the low-temperature state of high-temperature superconductors has been well established by angle-resolved photoemission spectroscopy (ARPES). We present a study of La1.83Sr0.17CuO4 in the superconducting state and report an abrupt change in the quasiparticle spectral function, as we follow the dispersion of the ARPES signal from the Fermi energy to 0.6 eV. The interruption in the quasiparticle dispersion separates coherent quasiparticle peaks at low energies from broad incoherent excitations at high energies. We find that the boundary between these low-energy and high-energy features exhibits a cosine-shaped momentum dependence, reminiscent of the superconducting d-wave gap. Further intriguing similarities between characteristics of the incoherent excitations and quasiparticle properties suggest a close relation between the electronic response at high and low energies in cuprate superconductors.

  • 11.
    Chang, Johan
    et al.
    Laboratory for Neutron Scattering, ETH Zurich, Paul Scherrer Institute, Villigen.
    Shi, Ming
    Swiss Light Source, Paul Scherrer Institute, Villigen.
    Pailhés, Stephane
    Laboratory for Neutron Scattering, ETH Zurich, Paul Scherrer Institute, Villigen.
    Månsson, Martin
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Claesson, Thomas
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Tjernberg, Oscar
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Bendounan, Azzedin
    Laboratory for Neutron Scattering, ETH Zurich, Paul Scherrer Institute, Villigen.
    Sassa, Yasmine
    Laboratory for Neutron Scattering, ETH Zurich, Paul Scherrer Institute, Villigen.
    Patthey, Luc
    Swiss Light Source, Paul Scherrer Institute, Villigen.
    Momono, Naoki
    Department of Physics, Hokkaido University, Sapporo.
    Oda, Migaku
    Department of Physics, Hokkaido University, Sapporo.
    Ido, Masayuki
    Department of Physics, Hokkaido University, Sapporo.
    Guerrero, S.
    Condensed Matter Theory Group, Paul Scherrer Institute, Villigen.
    Mudry, C.
    Condensed Matter Theory Group, Paul Scherrer Institute, Villigen.
    Mesot, Joël
    Laboratory for Neutron Scattering, ETH Zurich, Paul Scherrer Institute, Villigen.
    Anisotropic quasiparticle scattering rates in slightly underdoped to optimally doped high-temperature La2-xSrxCuO4 superconductors2008In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 78, no 20, p. 205103-Article in journal (Refereed)
    Abstract [en]

    An angle-resolved photoemission study of the scattering rate in the superconducting phase of the high-temperature superconductor La2-xSrxCuO4 with x=0.145 and x=0.17, as a function of binding energy and momentum, is presented. We observe that the scattering rate scales linearly with binding energy up to the high-energy scale E-1 similar to 0.4 eV. The scattering rate is found to be strongly anisotropic, with a minimum along the (0,0)-(pi,pi) direction. A possible connection to a quantum-critical point is discussed.

  • 12. Chen, Chih-Yao
    et al.
    Rizell, Josef
    Kanyolo, Godwill Mbiti
    Masese, Titus
    Sassa, Yasmine
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Kubota, Keigo
    Matsumoto, Kazuhiko
    Hagiwara, Rika
    Xu, Qiang
    High-voltage honeycomb layered oxide positive electrodes for rechargeable sodium batteries2020In: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, Vol. 56, no 65, p. 9272-9275Article in journal (Refereed)
    Abstract [en]

    Honeycomb layered oxides from Na2Ni2-xCoxTeO6 family were assessed for use as positive electrodes in rechargeable sodium batteries at ambient and elevated temperatures using ionic liquids. Substitution of nickel with cobalt increases the discharge voltage to nearly 4 V (versus Na+/Na), surpassing the average voltages of most Na based layered oxide positive electrodes.

  • 13.
    Claesson, Thomas
    et al.
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Månsson, Martin
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Dallera, Claudia
    INFM-Dipartimento di Fisica, Politecnico di Milano, Italy.
    Venturini, Federica
    Europ. Synchrt. Radiation Facility, Grenoble, France.
    De Nadaï, Celine
    Europ. Synchrt. Radiation Facility, Grenoble, France.
    Brookes, Nicholas B.
    Europ. Synchrt. Radiation Facility, Grenoble, France.
    Tjernberg, Oscar
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Angle Resolved Photoemission from Nd(1.85)Ce(0.15)CuO(4) using High Energy Photons: A Fermi Surface Investigation2004In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 93, no 13, p. 136402-1-136402-4Article in journal (Refereed)
    Abstract [en]

    We have performed an angle resolved photoemission study on a single crystal of the optimally electron doped (n-type) cuprate superconductor Nd2-xCexCuO4 (x=0.15) at a photon energy of 400 eV. The Fermi surface is mapped out and is, in agreement with earlier measurements, of hole-type with the expected Luttinger volume. However, comparing with previous low energy measurements, we observe a different Fermi surface shape and a different distribution of spectral intensity around the Fermi surface contour. The observed Fermi surface shape indicates a stronger electron correlation in the bulk as compared to the surface.

  • 14.
    Claesson, Thomas
    et al.
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Månsson, Martin
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Finazzi, M.
    Dallera, C.
    Cezar, J. C.
    Brookes, N. B.
    Tjernberg, Oscar
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Transfer of spectral weight across the magnetic transition in CoO: novel results from high-energy angle-resolved photoelectron spectroscopyManuscript (preprint) (Other academic)
  • 15.
    Claesson, Thomas
    et al.
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Månsson, Martin
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Önsten, Anneli
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Shi, Ming
    Swiss Light Source, Paul Scherrer Institut, Switzerland.
    Sassa, Yasmine
    Laboratory for Neutron Scattering, Zürich, Paul Scherrer Institut.
    Pailhés, Stephane
    Laboratory for Neutron Scattering, Zürich, Paul Scherrer Institut.
    Chang, Johan
    Laboratory for Neutron Scattering, Zürich, Paul Scherrer Institut.
    Bendounan, Azzedin
    Synchrotron SOLEIL, L'Orme des Merisiers, France.
    Patthey, Luc
    Swiss Light Source, Paul Scherrer Institut, Switzerland.
    Mesot, Joël
    Paul Scherrer Institute, ETH Zürich, Switzerland.
    Muro, Takayuki
    Japan Synchrotron Radiation Research Institute.
    Matsushita, Tomohiro
    Japan Synchrotron Radiation Research Institute.
    Kinoshita, Toyohiko
    Japan Synchrotron Radiation Research Institute.
    Nakamura, Tetsuya
    Japan Synchrotron Radiation Research Institute.
    Momono, Naoki
    Department of Physics, Hokkaido University, Japan.
    Oda, Migaku
    Department of Physics, Hokkaido University, Japan.
    Ido, Masayuki
    Department of Physics, Hokkaido University, Japan.
    Tjernberg, Oscar
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    The electronic structure of La(1.48)Nd(0.4)Sr(0.12)CuO(4) probed by high- and low-energy angle-resolved photoelectron spectroscopy: Evolution with probing depth2009In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 80, no 9, p. 094503-1-094503-6Article in journal (Refereed)
    Abstract [en]

    We present angle-resolved photoelectron spectroscopy data probing the electronic structure of the Nd-substituted high-T-c cuprate La1.48Nd0.4Sr0.12CuO4. Data have been acquired at low and high photon energies, h nu=55 and 500 eV, respectively. The two extracted Fermi surfaces show significant differences. The differences can be attributed to either the change in probing depth suggesting dissimilarity of the intrinsic electronic structure between surface and bulk regions, or a considerable c-axis dispersion signaling a strong interlayer coupling. At both photon energies, considerable spectral weight is observed at all points along the Fermi surface and the intensity distribution as well as Fermi-surface shape observed at low as well as high photon energy is markedly different from what has been previously reported for La1.28Nd0.6Sr0.12CuO4 by Zhou [Science 286, 268 (1999)]. Document Type: Article

  • 16.
    Duan, Yu-Xia
    et al.
    Cent S Univ, Sch Phys & Elect, Changsha 410083, Hunan, Peoples R China..
    Zhang, Cheng
    Cent S Univ, Sch Phys & Elect, Changsha 410083, Hunan, Peoples R China..
    Rusz, Jan
    Uppsala Univ, Dept Phys & Astron, Box 516, S-75120 Uppsala, Sweden..
    Oppeneer, Peter M.
    Uppsala Univ, Dept Phys & Astron, Box 516, S-75120 Uppsala, Sweden..
    Durakiewicz, Tomasz
    Marie Curie Sklodowska Univ, Lnstitute Phys, PL-20031 Lublin, Poland..
    Sassa, Yasmine
    Uppsala Univ, Dept Phys & Astron, Box 516, S-75120 Uppsala, Sweden.;Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden..
    Tjernberg, Oscar
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Berntsen, Magnus H.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Wu, Fan-Ying
    Cent S Univ, Sch Phys & Elect, Changsha 410083, Hunan, Peoples R China..
    Zhao, Yin-Zou
    Cent S Univ, Sch Phys & Elect, Changsha 410083, Hunan, Peoples R China..
    Song, Jiao-Jiao
    Cent S Univ, Sch Phys & Elect, Changsha 410083, Hunan, Peoples R China..
    Wu, Qi-Yi
    Cent S Univ, Sch Phys & Elect, Changsha 410083, Hunan, Peoples R China..
    Luo, Yang
    Cent S Univ, Sch Phys & Elect, Changsha 410083, Hunan, Peoples R China..
    Bauer, Eric D.
    Los Alamos Natl Lab, Condensed Matter & Magnet Sci Grp, Los Alamos, NM 87545 USA..
    Thompson, Joe D.
    Los Alamos Natl Lab, Condensed Matter & Magnet Sci Grp, Los Alamos, NM 87545 USA..
    Meng, Jian-Qiao
    Cent S Univ, Sch Phys & Elect, Changsha 410083, Hunan, Peoples R China.;Hunan Normal Univ, SICQEA, Changsha 410081, Hunan, Peoples R China..
    Crystal electric field splitting and f-electron hybridization in heavy-fermion CePt2In72019In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, no 8, article id 085141Article in journal (Refereed)
    Abstract [en]

    We use high-resolution angle-resolved photoemission spectroscopy to investigate the electronic structure of the antiferromagnetic heavy fermion compound CePt2In7, which is amember of the CeIn3-derived heavy fermion material family. Weak hybridization among 4f electron states and conduction bands was identified in CePt2In7 at low temperature much weaker than that in the other heavy fermion compounds like CeIrIn5 and CeRhIn5. The Ce 4f spectrum shows fine structures near the Fermi energy, reflecting the crystal electric field splitting of the 4f(5/2)(1) and 4f(7/2)(1) states. Also, we find that the Fermi surface has a strongly three-dimensional topology, in agreement with density-functional theory calculations.

  • 17.
    Elson, Frank
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Das, Debarchan
    Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland..
    Simutis, Gediminas
    Paul Scherrer Inst, Lab Neutron & Muon Instrumentat, CH-5232 Villigen, Switzerland.;Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Forslund, Ola Kenji
    Department of Physics, Chalmers University of Technology, Göteborg, SE-412 96, Sweden.
    Miniotaite, Ugne
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Palm, Rasmus
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Sassa, Yasmine
    Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
    Weissenrieder, Jonas
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Månsson, Martin
    TRIM Simulations Tool for mu(+) Stopping Fraction in Hydrostatic Pressure Cells2023In: 15th International Conference on Muon Spin Rotation, Relaxation and Resonance, MuSR 2022 / [ed] Prando, G Pratt, F, IOP Publishing , 2023, Vol. 2462, article id 012024Conference paper (Refereed)
    Abstract [en]

    For quantum systems or materials, a common procedure for probing their behaviour is to tune electronic/magnetic properties using external parameters, e.g. temperature, magnetic field or pressure. Pressure application as an external stimuli is a widely used tool, where the sample in question is inserted into a pressure cell providing a hydrostatic pressure condition. Such device causes some practical problems when using in Muon Spin Rotation/Relaxation (mu+SR) experiments as a large proportion of the muons will be implanted in the pressure cell rather than in the sample, resulting in a higher background signal. This issue gets further amplified when the temperature dependent response from the sample is much smaller than that of the pressure cell,which may cause the sample response to be lost in the background and cause difficulties in aligning the sample within the beam. To tackle this issue, we have used pySRIM [1] to construct a practical and helpful simulation tool for calculating muon stopping fractions, specifically for the pressure cell setup at the mu E1 beamline using the GPD spectrometer at the Paul Scherrer Institute, with the use of TRIM simulations. The program is used to estimate the number of muon stopping in both the sample and the pressure cell at a given momentum. The simultion tool is programmed into a GUI, making it accessible to user to approximate prior to their experiments at GPD what fractions will belong to the sample and the pressure cell in their fitting procedure.

  • 18.
    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.

  • 19. Fatuzzo, C. G.
    et al.
    Sassa, Y.
    Månsson, Martin
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF.
    Pailhes, S.
    Lipscombe, O. J.
    Hayden, S. M.
    Patthey, L.
    Shi, M.
    Grioni, M.
    Rønnow, H. M.
    Mesot, J.
    Tjernberg, Oscar
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF.
    Chang, J.
    Nodal Landau Fermi-liquid quasiparticles in overdoped La1.77Sr0.23CuO42014In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 89, no 20, p. 205104-Article in journal (Refereed)
    Abstract [en]

    Nodal angle-resolved photoemission spectra taken on overdoped La1.77Sr0.23CuO4 are presented and analyzed. It is proven that the low-energy excitations are true Landau Fermi-liquid quasiparticles. We show that momentum and energy distribution curves can be analyzed self-consistently without quantitative knowledge of the bare band dispersion. Finally, by imposing Kramers-Kronig consistency on the self-energy Sigma, insight into the quasiparticle residue is gained. We conclude by comparing our results to quasiparticle properties extracted from thermodynamic, magnetoresistance, and high-field quantum oscillation experiments on overdoped Tl2Ba2CuO6+delta.

  • 20.
    Faure, Quentin
    et al.
    Univ Grenoble Alpes, CEA, INAC MEM, Grenoble, France.;Univ Grenoble Alpes, Inst NEEL, Grenoble, France..
    Takayoshi, Shintaro
    Univ Geneva, Dept Quantum Matter Phys, Geneva, Switzerland..
    Petit, Sylvain
    Univ Paris Saclay, CNRS, CEA, CE Saclay,Lab Leon Brillouin, Gif Sur Yvette, France..
    Simonet, Virginie
    Univ Grenoble Alpes, Inst NEEL, Grenoble, France..
    Raymond, Stephane
    Univ Grenoble Alpes, CEA, INAC MEM, Grenoble, France..
    Regnault, Louis-Pierre
    Univ Grenoble Alpes, CEA, INAC MEM, Grenoble, France..
    Boehm, Martin
    Inst Laue Langevin, Grenoble, France..
    White, Jonathan S.
    Paul Scherrer Inst, Lab Neutron Scattering & Imaging, Villigen, Switzerland..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Material Physics, MF. Paul Scherrer Inst, Lab Neutron Scattering & Imaging, Villigen, Switzerland.
    Rueegg, Christian
    Univ Geneva, Dept Quantum Matter Phys, Geneva, Switzerland.;Paul Scherrer Inst, Lab Neutron Scattering & Imaging, Villigen, Switzerland..
    Lejay, Pascal
    Univ Grenoble Alpes, Inst NEEL, Grenoble, France..
    Canals, Benjamin
    Univ Grenoble Alpes, Inst NEEL, Grenoble, France..
    Lorenz, Thomas
    Univ Cologne, Phys Inst 2, Cologne, Germany..
    Furuya, Shunsuke C.
    RIKEN, Condensed Matter Theory Lab, Wako, Saitama, Japan..
    Giamarchi, Thierry
    Univ Geneva, Dept Quantum Matter Phys, Geneva, Switzerland..
    Grenier, Beatrice
    Univ Grenoble Alpes, CEA, INAC MEM, Grenoble, France..
    Topological quantum phase transition in the Ising-like antiferromagnetic spin chain BaCo2V2O82018In: Nature Physics, ISSN 1745-2473, E-ISSN 1745-2481, Vol. 14, no 7, p. 716-722Article in journal (Refereed)
    Abstract [en]

    Since the seminal ideas of Berezinskii, Kosterlitz and Thouless, topological excitations have been at the heart of our understanding of a whole novel class of phase transitions. In most cases, those transitions are controlled by a single type of topological objects. There are, however, some situations, still poorly understood, where two dual topological excitations fight to control the phase diagram and the transition. Finding experimental realizations of such cases is thus of considerable interest. We show here that this situation occurs in BaCo2V2O8, a spin-1/2 Ising-like quasi-one-dimensional antiferromagnet, when subjected to a uniform magnetic field transverse to the Ising axis. Using neutron scattering experiments, we measure a drastic modification of the quantum excitations beyond a critical value of the magnetic field. This quantum phase transition is identified, through a comparison with theoretical calculations, to be a transition between two different types of solitonic topological object, which are captured by different components of the dynamical structure factor.

  • 21.
    Faure, Quentin
    et al.
    Univ Grenoble Alpes, CEA, IRIG, MEM,MED, F-38000 Grenoble, France.;Univ Grenoble Alpes, Inst NEEL, F-38042 Grenoble, France..
    Takayoshi, Shintaro
    Max Planck Inst Phys Komplexer Syst, D-01307 Dresden, Germany.;Univ Geneva, Dept Quantum Matter Phys, CH-1211 Geneva, Switzerland..
    Simonet, Virginie
    Univ Grenoble Alpes, Inst NEEL, F-38042 Grenoble, France..
    Grenier, Beatrice
    Univ Grenoble Alpes, CEA, IRIG, MEM,MED, F-38000 Grenoble, France..
    Månsson, Martin
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics. Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland.
    White, Jonathan S.
    Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland..
    Tucker, Gregory S.
    Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland.;Ecole Polytech Fed Lausanne, Inst Phys, Lab Quantum Magnetism, CH-1015 Lausanne, Switzerland..
    Ruegg, Christian
    Univ Geneva, Dept Quantum Matter Phys, CH-1211 Geneva, Switzerland.;Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland.;Paul Scherrer Inst, Neutrons & Muons Res Div, CH-1211 Villigen, Switzerland..
    Lejay, Pascal
    Univ Grenoble Alpes, Inst NEEL, F-38042 Grenoble, France..
    Giamarchi, Thierry
    Univ Geneva, Dept Quantum Matter Phys, CH-1211 Geneva, Switzerland..
    Petit, Sylvain
    Univ Paris Saclay, CEA Saclay, CNRS, Lab Leon Brillouin,CEA, F-91191 Gif Sur Yvette, France..
    Tomonaga-Luttinger Liquid Spin Dynamics in the Quasi-One-Dimensional Ising-Like Antiferromagnet BaCo2V2O82019In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 123, no 2, article id 027204Article in journal (Refereed)
    Abstract [en]

    Combining inelastic neutron scattering and numerical simulations, we study the quasi-one-dimensional Ising anisotropic quantum antiferromagnet BaCo2V2O8 in a longitudinal magnetic field. This material shows a quantum phase transition from a Neel ordered phase at zero field to a longitudinal incommensurate spin density wave at a critical magnetic field of 3.8 T. Concomitantly, the excitation gap almost closes and a fundamental reconfiguration of the spin dynamics occurs. These experimental results are well described by the universal Tomonaga-Luttinger liquid theory developed for interacting spinless fermions in one dimension. We especially observe the rise of mainly longitudinal excitations, a hallmark of the unconventional low-field regime in Ising-like quantum antiferromagnetic chains.

  • 22.
    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.

  • 23.
    Forslund, Ola Kenji
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Andreica, Daniel
    Ioan Ursu Institute, Faculty of Physics, Babes-Bolyai University, 400084 Cluj-Napoca, Romania .
    Ohta, Hiroto
    Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan .
    Imai, Masaki
    Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502 Japan .
    Michioka, Chishiro
    Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502 Japan .
    Yoshimura, Kazuyoshi
    Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502 Japan .
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Sugiyama, Jun
    Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki 319-1106, Japan 6 Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan .
    Co-existence of short- and long-range magnetic order in LaCo2P22021In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. 96, no 12, p. 125864-Article in journal (Refereed)
    Abstract [en]

    The ferromagnetic (FM) nature of the metallic LaCo2P2 was investigated with the positive muon spin rotation, relaxation and resonance (μ+SR) technique. Transverse and zero field μ+ SR measurements revealed that the compound enters a long range FM ground state at   K, consistent with previous studies. Based on the reported FM structure, the internal magnetic field was computed at the muon sites, which were predicted with first principles calculations. The computed result agree well with the experimental data. Moreover, although LaCo2P2 is a paramagnet at higher temperatures T > 160 K, it enters a short range ordered (SRO) magnetic phase for   K. Measurements below the vicinity of   revealed that the SRO phase co-exists with the long range FM order at temperatures 124 K  . Such co-existence is an intrinsic property and may be explained by an interplay between spin and lattice degree of freedoms.

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  • 24.
    Forslund, Ola Kenji
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Andreica, Daniel
    Sassa, Yasmine
    Imai, Masaki
    Michioka, Chishiro
    Yoshimura, Kazuyoshi
    Guguchia, Zurab
    Shermadini, Zurab
    Khasanov, Rustem
    Sugiyama, Jun
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Pressure driven magnetic order in Sr1−xCaxCo2P2Manuscript (preprint) (Other academic)
  • 25.
    Forslund, Ola Kenji
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Andreica, Daniel
    Babes Bolyai Univ, Fac Phys, Cluj Napoca 400084, Romania..
    Sassa, Yasmine
    Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden..
    Imai, Masaki
    Kyoto Univ, Grad Sch Sci, Dept Chem, Kyoto 6068502, Japan..
    Michioka, Chishiro
    Kyoto Univ, Grad Sch Sci, Dept Chem, Kyoto 6068502, Japan..
    Yoshimura, Kazuyoshi
    Kyoto Univ, Grad Sch Sci, Dept Chem, Kyoto 6068502, Japan..
    Guguchia, Zurab
    Paul Scherrer Inst PSI, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland..
    Shermadini, Zurab
    Paul Scherrer Inst PSI, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland..
    Khasanov, Rustem
    Paul Scherrer Inst PSI, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland..
    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.
    Pressure driven magnetic order in Sr1-xCaxCo2P22022In: Scientific Reports, E-ISSN 2045-2322, Vol. 12, no 1, article id 17526Article in journal (Refereed)
    Abstract [en]

    The magnetic phase diagram of Sr1-xCaxCo2P2 as a function of hydrostatic pressure and temperature is investigated by means of high pressure muon spin rotation, relaxation and resonance (mu+SR). The weak pressure dependence for the x not equal 1- compounds suggests that the rich phase diagram of Sr1-xCaxCo2P2 as a function of x at ambient pressure may not solely be attributed to chemical pressure effects. The x = 1 compound on the other hand reveals a high pressure dependence, where the long range magnetic order is fully suppressed at p(c2) approximate to 9.8 kbar, which seem to be a first order transition. In addition, an intermediate phase consisting of magnetic domains is formed above p(c1) approximate to 8 kbar where they co-exist with a magnetically disordered state. These domains are likely to be ferromagnetic islands (FMI) and consist of an high- (FMI-(1)) and low-temperature (FMI-(2)) region, respectively, separated by a phase boundary at T-i approximate to 20 K. This kind of co-existence is unusual and is originating from a coupling between lattice and magnetic degrees of freedoms.

  • 26.
    Forslund, Ola Kenji
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Andreica, Daniel
    Faculty of Physics, Babes-Bolyai University, 400084 Cluj-Napoca, Romania.
    Sassa, Yasmine
    Uppsala University, Department of Physics & Astronomy, SE-75121 Uppsala, Sweden.
    Nozaki, Hiroshi
    Toyota Central Research and Development Laboratories Inc., Nagakute, Aichi 480-1192, Japan.
    Umegaki, Izumi
    Toyota Central Research and Development Laboratories Inc., Nagakute, Aichi 480-1192, Japan.
    Jonsson, Viktor
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Guguchia, Zurab
    Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
    Shermadini, Zurab
    Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
    Khasanov, Rustem
    Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
    Isobe, Masahiko
    Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany.
    Takagi, Hidenori
    Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany.
    Ueda, Yutaka
    Toyota Physical and Chemical Research Institute, Nagakute, Aichi 480-1192, Japan.
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Sugiyama, Jun
    Toyota Central Research and Development Laboratories Inc., Nagakute, Aichi 480-1192, Japan.
    μ+SR Study of K2Cr8O16 Under Hydrostatic Pressure2018In: Journal of the Physical Society of Japan, ISSN 0031-9015, E-ISSN 1347-4073Article in journal (Refereed)
    Abstract [en]

    In this study, the magnetic ground state of the hollandite type material K2Cr8O16 was tuned by externally applied pressure and investigated using µ+SR method in Zero-field (ZF) and weak-transversefield (wTF) configurations. As a result, the obtained magnetic transition temperature for the measuredpressures differs notably from magnetization measurements. Moreover, both wTF and ZF data reveala transition between two different magnetically ordered states at low temperatures for higher pressures. Further theoretical and experimental studies are currently being planned in order to elucidatethe detailed nature of the magnetically ordered phase. 

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    fulltext
  • 27.
    Forslund, Ola Kenji
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Andreica, Daniel
    Sugiyama, Jun
    Nocerino, Elisabetta
    Matsubara, Nami
    Takagi, Hidenori
    Simutis, Gediminas
    Khasanov, Rustem
    Isobe, Masahiko
    Sassa, Yasmine
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Quantum criticality in K2V8O16 under pressureManuscript (preprint) (Other academic)
  • 28.
    Forslund, Ola Kenji
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Gauthier, Nicolas
    Matsubara, Nami
    Ong, Chin Shen
    Nocerino, Elisabetta
    Kamazawa, Kazuya
    Ikeuchi, Kazuhiko
    Mazzone, Daniel
    Eriksson, Olle
    Franck, Sibille Romain
    dos Santos, Antonio M.
    Kirkham, Melanie
    Takagi, Hidenori
    Isobe, Masahiko
    Sugiyama, Jun
    Sassa, Yasmine
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Neutron scattering on a ferromagnetic metal-insulator transition compound K2Cr8O16Manuscript (preprint) (Other academic)
  • 29.
    Forslund, Ola Kenji
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Isobe, Masahiko
    Takagi, Hidenori
    Ofer, Oren
    Ansaldo, Eduardo J.
    Brewer, Jess H.
    Morris, Gerald
    Hitti, Bassam
    Arseneau, Donald
    Chow, Kim H.
    Sugiyama, Jun
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Tuning K2−xRbxV8O16 with chemical pressure: from a charge order stabilized quantum spin liquid to partially ordered stateManuscript (preprint) (Other academic)
  • 30.
    Forslund, Ola Kenji
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Muons as an Optimal Probe for Future All-Solid-State Energy Devices2017In: 2017-Sustainable Industrial Processing Summit SIPS 2017: Surfaces and Interfaces(SISAM), Composite, Ceramic and Nanomaterials, 2017Conference paper (Refereed)
    Download full text (pdf)
    fulltext
  • 31.
    Forslund, Ola Kenji
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Nocerino, Elisabetta
    Isobe, Masahiko
    Andreica, Daniel
    Cottrell, Stephen
    Takagi, Hidenori
    Sassa, Yasmine
    Sugiyama, Jun
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Charge order stabilized quantum spin liquid in the Hollandite K2V8O16Manuscript (preprint) (Other academic)
  • 32.
    Forslund, Ola Kenji
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Nocerino, Elisabetta
    Isobe, Masahiko
    Takagi, Hidenori
    dos Santos, Antonio M.
    Sugiyama, Jun
    Sassa, Yasmine
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    High-Pressure Neutron Diffraction on Quasi-1D Hollandite K2Cr8O16Manuscript (preprint) (Other academic)
  • 33.
    Forslund, Ola Kenji
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Nocerino, Elisabetta
    Umegaki, Izumi
    Delmas, Claude
    Koda, Akihiro
    Zubayer, Anton
    Sugiyama, Jun
    Sassa, Yasmine
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Phonon Assisted Ion Diffusion in Electrochemically cycled NaxCoO2 Manuscript (preprint) (Other academic)
  • 34.
    Forslund, Ola Kenji
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Ohta, Hiroto
    Kyoto Univ, Engn Educ Res Ctr, Grad Sch Engn, Kyoto 6158530, Japan.;Kyoto Univ, Grad Sch Sci, Dept Chem, Kyoto 6068502, Japan..
    Kamazawa, Kazuya
    CROSS Neutron Sci & Technol Ctr, Tokai, Ibaraki 3191106, Japan..
    Stubbs, Scott L.
    Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada..
    Ofer, Oren
    TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Michioka, Chishiro
    Kyoto Univ, Grad Sch Sci, Dept Chem, Kyoto 6068502, Japan..
    Yoshimura, Kazuyoshi
    Kyoto Univ, Grad Sch Sci, Dept Chem, Kyoto 6068502, Japan..
    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..
    Ansaldo, Eduardo J.
    Univ Saskatchewan, Dept Phys & Engn Phys, Saskatoon, SK S7N 5E2, Canada..
    Brewer, Jess H.
    Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada.;TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada..
    Sugiyama, Jun
    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..
    Revisiting the A-type antiferromagnet NaNiO2 with muon spin rotation measurements and density functional theory calculations2020In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 102, no 18, article id 184412Article in journal (Refereed)
    Abstract [en]

    An A-type antiferromagnet, NaNiO2, was examined by means of positive muon spin rotation and relaxation (mu+SR) measurements and first-principles calculations based on a density functional theory (DFT). Below T-N = 20 K, a clear muon spin precession signal was observed in the mu+SR time spectrum recorded under zero field, due to the formation of a static internal magnetic field. The microscopic origin of such an internal field was computed as a sum of dipolar and hyperfine contact fields at the site (0.624, 0, 0.854), where both the muon site and the local spin density at such a site were predicted with DFT calculations. While the computed values were consistent with experimentally obtained ones, in both the antiferromagnetic and the paramagnetic states, the contribution of the hyperfine contact field was shown to be insignificant even below T-N. Finally, measurements at higher temperatures signified thermally activated Na-ion diffusion with E-a = 50(20) meV and D-Na(300K) = 8.8 x 10(-11) cm(2)/s, commonly observed in layered-type compounds.

  • 35.
    Forslund, Ola Kenji
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Ong, Chin Shen
    Mazzone, Daniel
    Uchiyama, Hiroshi
    Horio, Masafumi
    Matsubara, Nami
    Nocerino, Elisabetta
    Mukkattukavil, Deepak John
    Papadopoulos, Konstantinos
    Takagi, Hidenori
    Isobe, Masahiko
    Sugiyama, Jun
    Chang, Johan
    Sassa, Yasmine
    Eriksson, Olle
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    The origin behind the FM metal-insulator K2Cr8O16Manuscript (preprint) (Other academic)
  • 36.
    Forslund, Ola Kenji
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Papadopoulos, Konstantinos
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Engineering.
    Nocerino, Elisabetta
    Di Berardino, Gaia
    Wang, Chennan
    Sugiyama, Jun
    Andreica, Daniel
    Vasiliev, Alexander N.
    Abdel-Hafiez, Mahmoud
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Sassa, Yasmine
    Spin dynamics in the Van der Waals magnet CrCl3Manuscript (preprint) (Other academic)
  • 37.
    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.

  • 38.
    Forslund, Ola Kenji
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Sassa, Yasmine
    Papadopoulos, Konstantinos
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Engineering.
    Goko, Tatsuo
    Scheuermann, Robert Johann
    Brewer, Jess H.
    Hitti, Bassam
    Prsa, Krunoslav
    Sugiyama, Jun
    Hagiwara, Masayuki
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Short range correlations in the Tomonaga-Luttinger liquid phase of BaCo2V2O8Manuscript (preprint) (Other academic)
  • 39.
    Forslund, Ola Kenji
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Sugiyama, Jun
    Andreica, Daniel
    Matsubara, Nami
    Nocerino, Elisabetta
    Umegaki, Izumi
    Brett, Calvin
    Roth, Stephan
    Söderberg, L. Daniel
    Hansen, Thomas
    Hoshikawa, Akinori
    Orain, Jean-Christophe
    Delmas, Claude
    Sassa, Yasmine
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Renewed magnetic phase diagram of NaxCoO2 synthesized by an electrochemical reactionManuscript (preprint) (Other academic)
  • 40.
    Forslund, Ola Kenji
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Sugiyama, Jun
    Nocerino, Elisabetta
    Zubayer, Anton
    Palm, Rasmus
    Elson, Frank
    Matsubara, Nami
    Johansson, Fredrik O.L.
    Shikano, Masahiro
    Masese, Titus
    Guguchia, Zurab
    Morris, Gerald
    Hitti, Bassam
    Arseneau, Donald
    Andreica, Daniel
    Sassa, Yasmine
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Magnetic Order & Spin Dynamics in the Honeycomb Family A2Ni2TeO6 (A= Li, Na and K)Manuscript (preprint) (Other academic)
  • 41.
    Forslund, Ola Kenji
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Toft-Petersen, Rasmus
    Vaknin, David
    van Well, Natalija
    Telling, Mark
    Sassa, Yasmine
    Sugiyama, Jun
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Juranyi, Fanni
    Li diffusion in single crystal LiFePO4 measured by muon spin spectroscopyManuscript (preprint) (Other academic)
  • 42. Gao, S.
    et al.
    Guratinder, K.
    Stuhr, U.
    White, J. S.
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics. Paul Scherrer Institute, Villigen, Switzerland.
    Roessli, B.
    Fennell, T.
    Tsurkan, V.
    Loidl, A.
    Ciomaga Hatnean, M.
    Balakrishnan, G.
    Raymond, S.
    Chapon, L.
    Garlea, V. O.
    Savici, A. T.
    Cervellino, A.
    Bombardi, A.
    Chernyshov, D.
    Rüegg, C.
    Haraldsen, J. T.
    Zaharko, O.
    Manifolds of magnetic ordered states and excitations in the almost Heisenberg pyrochlore antiferromagnet MgCr2 O42018In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 97, no 13, article id 134430Article in journal (Refereed)
    Abstract [en]

    In spinels ACr2O4(A=Mg, Zn), realization of the classical pyrochlore Heisenberg antiferromagnet model is complicated by a strong spin-lattice coupling: the extensive degeneracy of the ground state is lifted by a magneto-structural transition at TN=12.5 K. We study the resulting low-temperature low-symmetry crystal structure by synchrotron x-ray diffraction. The consistent features of x-ray low-temperature patterns are explained by the tetragonal model of Ehrenberg et al. [Pow. Diff. 17, 230 (2002)PODIE20885-715610.1154/1.1479738], while other features depend on sample or cooling protocol. A complex, partially ordered magnetic state is studied by neutron diffraction and spherical neutron polarimetry. Multiple magnetic domains of configuration arms of the propagation vectors k1=(12120),k2=(1012) appear. The ordered moment reaches 1.94(3) μB/Cr3+ for k1 and 2.08(3) μB/Cr3+ for k2, if equal amount of the k1 and k2 phases is assumed. The magnetic arrangements have the dominant components along the [110] and [1-10] diagonals and a smaller c component. We use inelastic neutron scattering to investigate the spin excitations, which comprise a mixture of dispersive spin waves propagating from the magnetic Bragg peaks and resonance modes centered at equal energy steps of 4.5 meV. We interpret these as acoustic and optical spin wave branches, but show that the neutron scattering cross sections of transitions within a unit of two corner-sharing tetrahedra match the observed intensity distribution of the resonances. The distinctive fingerprint of clusterlike excitations in the optical spin wave branches suggests that propagating excitations are localized by the complex crystal structure and magnetic orders.

  • 43.
    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.

  • 44.
    Grishin, Michael A.
    et al.
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Karlsson, Henrik S.
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Månsson, Martin
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Karlsson, Ulf O.
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Electron structure and electron dynamics at InSb(111)2×2 semiconductor surface2003In: Applied Physics A: Materials Science & Processing, ISSN 0947-8396, E-ISSN 1432-0630, Vol. 76, no 3, p. 299-302Article in journal (Refereed)
    Abstract [en]

    The conduction band electronic structure and the electron dynamics of the clean InSb(111)2 x 2 surface have been studied by laser based pump-and-probe photoemission. The results are compared to earlier studies of the InSb(110) surface. It is found that both the energy location and the time dependence of the photoexcited structures are very similar for the two surfaces. This indicates that the dominant part of the photoemission signal in the conduction band region is due to excitations of electrons in the bulk region and that the surface electronic states play a minor role. The fast decay of the excited state, tau similar to 12 ps, indicates that diffusion of hot electrons into the bulk is an important mechanism.

  • 45.
    Grishin, Michael A.
    et al.
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Månsson, Martin
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Tjernberg, Oscar
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Claesson, Thomas
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Karlsson, Henrik S.
    Optillion AB.
    Karlsson, Ulf O.
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    A bandgap surface state at the GaSb(001) surface observed by femtosecond laser pump-and-probe photoemission spectroscopyManuscript (Other academic)
  • 46.
    Grishin, Michael A.
    et al.
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Månsson, Martin
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Tjernberg, Oscar
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    Karlsson, Henrik S.
    Optillion AB.
    Karlsson, Ulf O.
    KTH, Superseded Departments (pre-2005), Microelectronics and Information Technology, IMIT.
    A new two-dimensional angle-resolving multi-anode electron detector for femtosecond photoemission spectroscopyArticle in journal (Other academic)
  • 47.
    Grishin, Michael A.
    et al.
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Månsson, Martin
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
    Tjernberg, Oscar
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Karlsson, Henrik S.
    Optillion AB, Stockholm.
    Karlsson, Ulf O.
    KTH, School of Information and Communication Technology (ICT), Material Physics.
    Anisotropy of electron structure at InAs(111) surfaces by laser pump-and-probe photoemission spectroscopy2005In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 574, no 1, p. 89-94Article in journal (Refereed)
    Abstract [en]

    The electronic structure and the electron dynamics of the clean InAs(111)A 2 x 2 and the InAs(111)B 1 x 1 surfaces have been studied by laser pump-and-probe photoemission spectroscopy. Normally unpopulated electron states above the valence band maximum (VBM) are filled on the InAs(111)A surface due to the conduction band pinning above the Fermi level (E-F). Accompanied by the downward band banding alignment, a charge accumulation layer is confined to the surface region creating a two dimensional electron gas (2DEG). The decay of the photoexcited carriers above the conduction band minimum (CBM) is originated by bulk states affected by the presence of the surface. No occupied states were found on the InAs(111)B 1 x 1 surface. This fact is suggested to be due to the surface stabilisation by the charge removal from the surface into the bulk. The weak photoemission intensity above the VBM on the (111)B surface is attributed to electron states trapped by surface defects. The fast decay of the photoexcited electron states on the (111)A and the (111)B surfaces was found to be tau(111A) less than or equal to 5 ps and tau(111B) less than or equal to 4ps, respectively. We suggest the diffusion of the hot electrons into the bulk is the decay mechanism. (

  • 48.
    Hellsvik, Johan
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory.
    Perez, Roberto Diaz
    Nordita SU.
    Geilhufe, Matthias
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Materials and Nanophysics.
    Balatsky, Alexander V.
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Spin wave excitations of magnetic metalorganic materials2020In: Physical Review Materials, E-ISSN 2475-9953, Vol. 4, no 2, article id 024409Article in journal (Refereed)
    Abstract [en]

    The Organic Materials Database (OMDB) is an open database hosting about 22 000 electronic band structures, density of states, and other properties for stable and previously synthesized three-dimensional organic crystals. The web interface of the OMDB offers various search tools for the identification of novel functional materials such as band structure pattern matching and density of states similarity search. In this work, the OMDB is extended to include magnetic excitation properties. For inelastic neutron scattering, we focus on the dynamic structure factor S(q, omega) which contains information on the excitation modes of the material. We introduce a new dataset containing atomic magnetic moments and Heisenberg exchange parameters for which we calculate the spin wave spectra and dynamic structure factor with linear spin wave theory and atomistic spin dynamics. We thus develop the materials informatics tools to identify novel functional organic and metalorganic magnets.

  • 49.
    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.

  • 50.
    Horio, M.
    et al.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
    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..
    Kramer, K.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
    Sutter, D.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
    Cook, A. M.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
    Sassa, Y.
    Uppsala Univ, Dept Phys & Astron, SE-75121 Uppsala, Sweden..
    Hauser, K.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
    Månsson, Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Plumb, N. C.
    Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland..
    Shi, M.
    Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland..
    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..
    Neupert, T.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
    Chang, J.
    Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
    Two-dimensional type-II Dirac fermions in layered oxides2018In: Nature Communications, E-ISSN 2041-1723, Vol. 9, article id 3252Article in journal (Refereed)
    Abstract [en]

    Relativistic massless Dirac fermions can be probed with high-energy physics experiments, but appear also as low-energy quasi-particle excitations in electronic band structures. In condensed matter systems, their massless nature can be protected by crystal symmetries. Classification of such symmetry-protected relativistic band degeneracies has been fruitful, although many of the predicted quasi-particles still await their experimental discovery. Here we reveal, using angle-resolved photoemission spectroscopy, the existence of two-dimensional type-II Dirac fermions in the high-temperature superconductor La1.77Sr0.23CuO4. The Dirac point, constituting the crossing of d(x2-y2) and d(z2) bands, is found approximately one electronvolt below the Fermi level (E-F) and is protected by mirror symmetry. If spin-orbit coupling is considered, the Dirac point degeneracy is lifted and the bands acquire a topologically non-trivial character. In certain nickelate systems, band structure calculations suggest that the same type-II Dirac fermions can be realised near EF.

123 1 - 50 of 142
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