Unusual Phase Boundary Of The Magnetic-Field-Tuned Valence Transition In Ceos4sb12
arxiv(2020)
摘要
The phase diagram of the filled skutterudite CeOs4Sb12 has been mapped in fields mu H-0 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 L phase from the metallic high-H, high-T 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 proportional to 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 CeOs4Sb12 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 CeOs4Sb12 to a topological semimetal phase induced by uniaxial stress.
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关键词
unusual phase boundary,magnetic-field-tuned magnetic-field-tuned,valence transition
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