Valence Transition in CeOs<sub>4</sub>Sb<sub>12 </sub>and Its <i>T</i>-<i>H</i> Phase Diagram

POSTER

Abstract

The filled skutterudite compound CeOs4Sb12 displays Kondo insulating behavior accompanied by a ~1 K Spin-Density-Wave order state. Recently it has also been suggested as a potential topological insulator. In penetration depth and magnetic susceptibility measurements, we found a Fermi-surface reconstruction in CeOs4Sb12 and an unusual phase boundary in the temperature T vs magnetic field H diagram associated with the valence transition from the Ce4+ to Ce3+ state, denoted as an L and an H phase, respectively. Based on the experimental features from magnetostriction, magnetoresistance, and high T skin depth, a newly modified T-H phase boundary of the L to H phases becoming much broader than what originally thought.1,2 The cyclotron mass of the conduction electron has a significant enhancement below ~35 T.
1 arXiv:1907.09181 2 PRB 94, 205140 (2016).

*Research at CSU-Fresno is supported by NSF DMR-1905636; at UCSD by NSF DMR-1810310 & US DOE DEFG02-04ER46105; at Hokkaido U by JSPS KAKENHI JP15KK0146, JP15H05885 & JP18H04297; at U of Warwick by the EPSRC & ERC under the European Union’s Horizon 2020 research & innovation programme grant No 681260; at the NHMFL, USA by NSF DMR-1644779, State of FL, US DoE & DoE Basic Energy Science Field Work Project Science in 100 T.

Presenters

  • Pei-Chun Ho

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

Authors

  • Pei-Chun Ho

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

  • John Singleton

    • NHMFL, LANL

  • Marcelo Jaime

    • Los Alamos Natl Lab
    • Los Alamos National Laboratory
    • NHMFL, LANL

  • 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

  • Paul Goddard

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

  • Kalyan Sasmal

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

  • 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

  • Tatsuya Yanagisawa

    • Physics, Hokkaido University
    • Department of Physics, Hokkaido University