Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs4Sb12

Kathrin Götze, Matthew Pearce, Matthew J Coak, Paul Goddard*, Audrey Grockowiak, William Coniglio, Stanley W Tozer, David Earl Graf, M Brian Maple, Pei-Chun Ho, Matthew Brown, John Singleton*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

CeOs4Sb12, a member of the skutterudite family, has an unusual semimetallic low-temperature L-phase that inhabits a wedge-like area of the field H—temperature T phase diagram. We have conducted measurements of electrical transport and megahertz conductivity on CeOs4Sb12 single crystals under pressures of up to 3 GPa and in high magnetic fields of up to 41 T to investigate the influence of pressure on the different H–T phase boundaries. While the high-temperature valence transition between the metallic H-phase and the L-phase is shifted to higher T by pressures of the order of 1 GPa, we observed only a marginal suppression of the S-phase that is found below 1 K for pressures of up to 1.91 GPa. High-field quantum oscillations have been observed for pressures up to 3.0 GPa and the Fermi surface of the high-field side of the H-phase is found to show a surprising decrease in size with increasing pressure, implying a change in electronic structure rather than a mere contraction of lattice parameters. We evaluate the field-dependence of the effective masses for different pressures and also reflect on the sample dependence of some of the properties of CeOs4Sb12 which appears to be limited to the low-field region.
Original languageEnglish
Article number043044
Number of pages11
JournalNew Journal of Physics
Volume24
Issue number4
DOIs
Publication statusPublished - 29 Apr 2022

Keywords

  • pressure
  • valence transition
  • CeOs4Sb12
  • quantum oscillations
  • quantum criticality

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