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

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 $[0\bar{1}1]$ 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 $\alpha -\gamma$ transition in Ce and its alloys.

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Cited by in corpus (4)

• Enhancement of the effective mass at high magnetic fields in CeRhIn${}_5$
• Unusual phase boundary of the magnetic-field-tuned valence transition in CeOs${}_4$Sb${}_{12}$
• Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs${}_4$Sb${}_{12}$
• Fermi surface topology and non-trivial Berry phase in the flat-band semimetal Pd${}_3$Pb