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