Phase diagram and Fermi surface of CeOs<sub>4</sub>Sb<sub>12</sub> under pressure

ORAL

Abstract

The skutterudite CeOs4Sb12 exhibits an unusual phase diagram in which the boundary of the field-tuned valence transition between L and H phase takes a wedge-like shape as opposed to the expected elliptical behavior. A quantum critical point (QCP) associated with the field-induced suppression of the low-temperature ordered spin density wave (SDW) phase is thought to be responsible for this anomalous behavior [1, 2].
We present measurements of resistivity, Hall and magnetoresistance, and TDO conductivity under pressures of up to 3 GPa and in magnetic fields up to 41 T. We find that the SDW phase starts to be suppressed at 1.5 GPa, and that the Fermi surface, established by quantum oscillations, experiences an alteration in size and anisotropy with increasing pressure.
We will discuss the phase diagram of CeOs4Sb12 under pressure and the implications of a shift of the QCP.

[1] Goetze et al., PRB 101 (2020).
[2] Ho et al., PRB 94 (2016).

*Research at CSU-Fresno is supported by the NSF-DMR1905636; at UCSD by NSF-DMR181031 and US DOE DE-FG02-04ER46105; at Univ. of Warwick by EPSRC & ERC. Part of this work was performed at the NHMFL, which is supported by NSF Cooperative Agreement No. DMR-1157490/1644779 and by the State of Florida; by US DOE, and through DOE BES FWP Science in 100 T.

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Presenters

  • Kathrin Goetze

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

Authors

  • Kathrin Goetze

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

  • Matthew Pearce

    • Department of Physics, University of Warwick
    • Physics, University of Warwick
    • University of Warwick

  • Matthew J Coak

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

  • Paul Goddard

    • Department of Physics, University of Warwick
    • University of Warwick
    • Physics, University of Warwick

  • William A Coniglio

    • National High Magnetic Field Laboratory
    • National High Magnetic Field Laboratory, Tallahassee and Florida State University
    • NHMFL, Florida State University

  • Audrey Grockowiak

    • National High Magnetic Field Laboratory, Tallahassee and Florida State University
    • NHMFL, Florida State University

  • Stanley W Tozer

    • National High Magnetic Field Laboratory, Tallahassee and Florida State University
    • NHMFL, Florida State University

  • David E Graf

    • National High Magnetic Field Laboratory
    • Florida State University
    • National High Magnetic Field Lab, Florida State University
    • National High Magnetic Field Laboratory, Tallahassee and Florida State University
    • National High Magnetic Field Laboratory, Florida State University
    • National High Magnetic Field Laboratory (FSU)
    • Department of Physics, Florida State University
    • National High Magnetic Field Laboratory and Department of Physics, Florida State University
    • National High Magnetic Field Lab
    • National High Magnetic Field Laboratory, Tallahassee, FL
    • CMS, National High Magnetic Laboratory

  • M Brian Maple

    • Department of Physics, University of California, San Diego
    • University of California, San Diego
    • Physics, Univ. of California, San Diego

  • Matthew Brown

    • Department of Physics, California State University, Fresno
    • Physics, California State Univ., Fresno

  • Pei-Chun Ho

    • Department of Physics, California State University, Fresno
    • Physics, California State Univ., Fresno

  • John Singleton

    • National High Magnetic Field Laboratory, Los Alamos National Laboratory
    • Los Alamos National Lab
    • Los Alamos National Laboratory
    • LANL, NHMFL
    • National High Magnetic Field Laboratory (NHMFL), Los Alamos