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Brown, Matthew
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Publications (7/7 displayed)
- 2022Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs4Sb12citations
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- 2019199-OR: Time-Restricted Feeding Ameliorates Metabolic Dysfunction through the Restoration of Circadian Beta-Cell Function and Transcriptional Identity
- 2015Influence of destructuration of soft clay on time-dependent settlements:Comparison of some elastic viscoplastic modelscitations
- 2013The influence of destructuration of soft clay on time-dependent settlements – a comparison of some elastic visco-plastic models.
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article
Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs4Sb12
Abstract
CeOs<sub>4</sub>Sb<sub>12</sub>, 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 CeOs<sub>4</sub>Sb<sub>12</sub> 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 CeOs<sub>4</sub>Sb<sub>12</sub> which appears to be limited to the low-field region.