Unusual phase boundary of the magnetic-field-tuned valence transition in
The phase diagram of the filled skutterudite $$CeOs_4Sb_{12}$$ has been mapped in fields $$μ_0H$$ of up to 60 T and temperatures $$T$$ down to 0.5 K using resistivity, magnetostriction, and megahertz conductivity. The valence transition separating the semimetallic low-$$H$$, low-$$T\mathscr{L}$$ phase from the metallic high-$$H$$, high-$$T\mathscr{H}$$ phase exhibits a very unusual, wedge-shaped phase boundary, with a nonmonotonic gradient alternating between positive and negative. The expected “elliptical” behavior of the phase boundary of a valence transition with $H^2∝T^2$ 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 $$CeOs_4Sb_{12}$$ from this textbook 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 $$CeOs_4Sb_{12}$$ to a topological semimetal phase induced by uniaxial stress.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); European Research Council (ERC); Japan Society for the Promotion of Science (JSPS); Engineering and Physical Sciences Resource Council (EPSRC); State of Florida
- Grant/Contract Number:
- 89233218CNA000001; FG02-04ER46105; DMR-1157490; DMR-1644779; DMR-1810310; DMR-1905636; DMR-1506677; 681260; JP15KK0146; JP18H04297; JP17K05525
- OSTI ID:
- 1596893
- Alternate ID(s):
- OSTI ID: 1634957; OSTI ID: 1829630
- Report Number(s):
- LA-UR-19-26722; LA-UR-20-21171; PRBMDO; 075102
- Journal Information:
- Physical Review. B, Journal Name: Physical Review. B Vol. 101 Journal Issue: 7; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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