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27 April 2024 |
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Unusual phase boundary of the magnetic-field-tuned valence transition in CeOs$_4$Sb$_{12}$ | | K. Götze
; M. J. Pearce
; P. A. Goddard
; M. Jaime
; M. B. Maple
; K. Sasmal
; T. Yanagisawa
; A. McCollam
; T. Khouri
; P.-C. Ho
; J. Singleton
; | | Date: |
22 Jul 2019 | | Abstract: | The phase diagram of the filled skutterudite CeOs$_4$Sb$_{12}$ has been
mapped in fields $H$ of up to 60 T and temperatures $T$ down to 0.5 K using
resistivity, magnetostriction, and MHz conductivity. The valence transition
separating the semimetallic, low-$H$, low-$T$, $cal{L}$ phase from the
metallic high-$H$, high-$T$ $cal{H}$ phase exhibits a very unusual,
wedge-shaped phase boundary, with a non-monotonic gradient alternating between
positive and negative. This is quite different from the text-book
’’elliptical’’ phase boundary usually followed by valence transitions. Analysis
of Shubnikov-de Haas oscillations within the $cal{H}$ phase reveals an
effective mass that increases as $H$ drops toward the $cal{H-L}$ phase
boundary, suggesting proximity to a quantum-critical point. The associated
magnetic fluctuations may be responsible for the anomalous $H,T$ dependence of
the valence transition at high $H$, whereas the low$-H$, high$-T$ portion of
the phase boundary may rather be associated with the proximity of
CeOs$_4$Sb$_{12}$ to a topological semimetal phase induced by uniaxial stress. | | Source: | arXiv, 1907.9181 | | Services: | Forum | Review | PDF | Favorites | |
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