Fermi-surface topologies and low-temperature phases of the filled Skutterudite compounds CeOs$_4$Sb$_{12}$ and NdOs$_4$Sb$_{12}$

Pei Chun Ho; John Singleton; Paul A. Goddard; Fedor F. Balakirev; Shalinee Chikara; Tatsuya Yanagisawa; M. Brian Maple; David B. Shrekenhamer; Xia Lee; Avraham T. Thomas

doi:10.1103/PhysRevB.94.205140

paper

Fermi-surface topologies and low-temperature phases of the filled Skutterudite compounds CeOs $_{4}$ Sb $_{12}$ and NdOs $_{4}$ Sb $_{12}$

arXiv:1611.00318 · doi:10.1103/PhysRevB.94.205140

Abstract

MHz conductivity, torque magnetometer and magnetization measurements are reported on single crystals of CeOs $_{4}$ Sb $_{12}$ and NdOs $_{4}$ Sb $_{12}$ using temperatures down to 0.5~K and magnetic fields of up to 60~tesla. The field-orientation dependence of the de Haas-van Alphen and Shubnikov-de Haas oscillations is deduced by rotating the samples about the $[010]$ and $[0 1 ˉ 1]$ directions. The results indicate that NdOs $_{4}$ Sb $_{12}$ has a similar Fermi surface topology to that of the unusual superconductor PrOs $_{4}$ Sb $_{12}$ , but with significantly smaller effective masses, supporting the importance of local phonon modes in contributing to the low-temperature heat capacity of NdOs $_{4}$ Sb $_{12}$ . By contrast, CeOs $_{4}$ Sb $_{12}$ undergoes a field-induced transition from an unusual semimetal into a high-field, high-temperature state characterized by a single, almost spherical Fermi-surface section. The behavior of the phase boundary and comparisons with models of the bandstructure lead us to propose that the field-induced phase transition in CeOs $_{4}$ Sb $_{12}$ is similar in origin to the well-known $α - γ$ transition in Ce and its alloys.

Fermi-surface topologies and low-temperature phases of the filled Skutterudite compounds CeOs $_{4}$ Sb $_{12}$ and NdOs $_{4}$ Sb $_{12}$

Abstract

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Fermi-surface topologies and low-temperature phases of the filled Skutterudite compounds CeOs4​Sb12​ and NdOs4​Sb12​

Abstract

References in corpus (6)

Cited by in corpus (2)

Fermi-surface topologies and low-temperature phases of the filled Skutterudite compounds CeOs $_{4}$ Sb $_{12}$ and NdOs $_{4}$ Sb $_{12}$