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X-ray and neutron-diffraction studies of the CeOs<sub>4</sub>Sb<sub>12</sub> valence transition at low temperatures and high magnetic fields

ORAL

Abstract

CeOs4Sb12 exhibits a very unusual field- and temperature-driven valence transition that is accompanied by a drastic change in Fermi-surface topology. It is also a candidate heavy-fermion topological semimetal and sports a field-induced quantum-critical point at about 20 T. Single crystal x-ray diffraction in pulsed magnetic fields of up to 30 T using a unique instrumental combination at the Advanced Photon Source permitted a study of the change in unit-cell volume as the field swept through the valence transition. In addition, neutron-diffraction measurements probed the analogous structural changes as a function of temperature in zero magnetic field. Both measurements shed light on the unique “wedge-shaped” phase boundary that marks the valence transition in CeOs4Sb12.

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Presenters

  • John Singleton

    National High Magnetic Field Lab, Los Alamos, Los Alamos National Laboratory, NHMFL, Los Alamos National Laboratory, National High Magnetic Field Laboratory, Los Alamos National Laboratory, NHMFL, Los Alamos National Lab, Los Alamos National Lab.

Authors

  • John Singleton

    National High Magnetic Field Lab, Los Alamos, Los Alamos National Laboratory, NHMFL, Los Alamos National Laboratory, National High Magnetic Field Laboratory, Los Alamos National Laboratory, NHMFL, Los Alamos National Lab, Los Alamos National Lab.

  • Kathrin Goetze

    HLD (HZDR) / TU Dresden, Physics, Warwick University, Physics, University of Warwick, University of Warwick, Department of Physics, University of Warwick, Physics Department, University of Warwick, Coventry, CV4 7AL, United Kingdom

  • Matthew Pearce

    Physics, Warwick University, Physics, University of Warwick, University of Warwick, Department of Physics, University of Warwick, Physics Department, University of Warwick, Coventry, CV4 7AL, United Kingdom

  • Zahirul Islam

    Argonne National Laboratory, APS synchrotron, Argonne National Laboratory, Advanced Photon Source, Argonne National Laboratory, Physics, Argonne National Laboratory, Argonne Natl Lab

  • Ulrich Welp

    Argonne National Laboratory, Argonne Natl Lab, Materials Science Division, Argonne National Laboratory, Materials Science Division, Argonne Natl Lab, Argonne National Lab

  • Paul Goddard

    Physics, Warwick University, Department of Physics, University of Warwick, Univ of Warwick, Physics, University of Warwick, University of Warwick

  • Roger Johnson

    Department of Physics and Astronomy, University College London, University College London

  • Pascal Manuel

    ISIS Facility, Rutherford Appleton Laboratory-STFC, ISIS Neutron Source, ISIS, STFC RAL, ISIS facility, Rutherford Appleton Laboratory, ISIS, Rutherford Appleton Laboratory, ISIS, Rutherford Appleton Laboratory, UK

  • M Brian Maple

    Department of Physics, University of California, San Diego, UCSD, University of California, San Diego, physics, University of Califormia, San Diego, Departement of Physics, University fo California, San Diego, Physics, University of California, San Diego

  • Pei-Chun Ho

    Physics, Fresno State University