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Unusual phase boundary of the magnetic-field-tuned valence transition in CeOs4Sb12
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Gotze, Kathrin, Pearce, Matthew J., Goddard, Paul, Jaime, M., Maple, M. B., Sasmal, K., Yanagisawa, Tatsuya, McCollam, A., Khouri, T., Ho , P -C. and Singleton, J. (2020) Unusual phase boundary of the magnetic-field-tuned valence transition in CeOs4Sb12. Physical Review B (Condensed Matter and Materials Physics), 101 (7). 075102. doi:10.1103/PhysRevB.101.075102 ISSN 1098-0121.
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Official URL: https://doi.org/10.1103/PhysRevB.101.075102
Abstract
The phase diagram of the filled skutterudite has been mapped in fields
H of up to and temperatures T down to using resistivity, magnetostriction, and MHz conductivity. The valence transition separating the semimetallic low-H, low-T L phase from the metallic high-H, high-T H phase exhibits a very unusual, wedge-shaped phase boundary, with a non-monotonic gradient alternating between positive and negative. The expected "elliptical" behavior of the phase boundary of a valence transition with H2∝T2 originates in the H
and T dependence of the free energy of the f~multiplet. Here, quantum oscillation measurements suggest that additional energy scales associated with a quantum critical point are responsible for the deviation of the phase boundary of from this text-book behavior at high H and low T. The distortion of the low-H, high-T portion of the phase boundary may be associated with the proximity of to a topological semimetal phase induced by uniaxial stress.
| Item Type: | Journal Article | ||||||||||||||||||||||||||||||||||||||||||
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| Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||||||||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Valence fluctuations, Skutterudite, Magnetic fields | ||||||||||||||||||||||||||||||||||||||||||
| Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||||||||||||||||||||||||||||||||||||||||
| Publisher: | American Physical Society | ||||||||||||||||||||||||||||||||||||||||||
| ISSN: | 1098-0121 | ||||||||||||||||||||||||||||||||||||||||||
| Official Date: | 3 February 2020 | ||||||||||||||||||||||||||||||||||||||||||
| Dates: |
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| Volume: | 101 | ||||||||||||||||||||||||||||||||||||||||||
| Number: | 7 | ||||||||||||||||||||||||||||||||||||||||||
| Article Number: | 075102 | ||||||||||||||||||||||||||||||||||||||||||
| DOI: | 10.1103/PhysRevB.101.075102 | ||||||||||||||||||||||||||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||||||||||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||||||||||||||||||||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||||||||||||||||||||||||||||||||
| Date of first compliant deposit: | 9 January 2020 | ||||||||||||||||||||||||||||||||||||||||||
| Date of first compliant Open Access: | 7 February 2020 | ||||||||||||||||||||||||||||||||||||||||||
| RIOXX Funder/Project Grant: |
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