Exploring the valence transition in CeOs4Sb12 in high magnetic fields

ORAL

Abstract

We present measurements of resistivity, magnetostriction, and PDO conductivity on the skutterudite CeOs4Sb12 in static and pulsed magnetic fields up to 30/60 T, respectively. The temperature and field dependencies allow us to map out the boundaries of the low temperature phase (L phase) in the H-T-phase diagram which - contrary to previous results - shows an unusual dome-like appearance extending to 45 T. The L phase is characterized by semiconducting behaviour with a small Fermi surface whereas the metallic high-temperature, high-field H phase exhibits a large Fermi surface. Magnetostriction results suggest that the L to H transition is accompanied by a valence transition. Additional features in transport and PDO within the L phase point towards further alteration of the band structure with applied field. We discuss the phase diagram of CeOs4Sb12 in the context of hybridization of 4f electrons and compare it to other skutterudites.

*Research at CSU-Fresno is supported by the NSF; at UCSD by NSF and US DOE; at Hokkaido U. by JSPS KAKENHI; at Univ. of Warwick by EPSRC and ERC. Work performed at NHMFL is supported by NSF, the State of Florida, US DOE, and through DOE Basic Energy Science Field Work Project Science in 100 T. We acknowledge support of HFML-RU/FOM, member of the EMFL.

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Presenters

  • Kathrin Goetze

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

Authors

  • Kathrin Goetze

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

  • Matthew J. Pearce

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

  • Paul Goddard

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

  • Alix McCollam

    • High Field Magnet Laboratory (HFML-EMFL), Radboud University, 6525 ED Nijmegen, The Netherlands
    • High Field Magnet Laboratory (HFML-EMFL), Radboud University, Toernooiveld 7, 6525 ED, Nijmegen, The Netherlands
    • High Field Magnet Laboratory (HFML-EMFL), Radboud University

  • Thomas Khouri

    • High Field Magnet Laboratory (HFML-EMFL), Radboud University, Toernooiveld 7, 6525 ED, Nijmegen, The Netherlands

  • Marcelo Jaime

    • National High Magnetic Field Laboratory, Los Alamos
    • Los Alamos National Laboratory
    • National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM 87545
    • NHMFL, Los Alamos National Labs
    • NHMFL-LANL
    • Pulsed Field Faclity, National High Magnetic Field Laboratory

  • M Brian Maple

    • University of California, San Diego
    • Department of Physics, University of California, San Diego, La Jolla, CA 92093
    • Department of Physics, University of California, San Diego
    • UC San Diego
    • Physics, University of California, San Diego
    • Department of Physics, University of California, San Diego, CA 92093, USA
    • Physics, University of California, SanDiego

  • Kalyan Sasmal

    • University of California, San Diego
    • Department of Physics, University of California, San Diego, La Jolla, CA 92093
    • Department of Physics, University of California, San Diego
    • Department of Physics, University of California, San Diego, CA 92093, USA

  • Tatsuya Yanagisawa

    • Department of Physics, Hokkaido University, Sapporo 060-0810, Japan
    • Hokkaido University
    • Physics, Hokkaido University

  • John Singleton

    • National High Magnetic Field Laboratory, Los Alamos National Laboratory
    • MPA-MAG, Los Alamos National Laboratory
    • National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM 87545
    • Los Alamos National Laboratory
    • NHMFL, Los Alamos National Labs
    • NHMFL, Los Alamos National Laboratory
    • Los Alamos, National High Magnetic Field Laboratory
    • NHMFL, Los Alamos Natl Lab
    • Los Alamos Natl Lab

  • Pei-Chun Ho

    • Department of Physics, California State University, Fresno, Fresno, CA 93740
    • California State University, Fresno
    • Physics, California State University, Fresno
    • Department of Physics, California State University, Fresno, CA 93740, USA.