Transport properties in CeOs${}_4$Sb${}_{12}$: Possibility of the ground state being semiconducting

Abstract

We have measured both magnetoresistance and Hall effect in CeOs${}_4$Sb${}_{12}$ to clarify the large resistivity state ascribed to the Kondo insulating one and the origin of the phase transition near 0.9 K reported in the specific heat measurement. We found unusual temperature ($T$) dependence both in the electrical resistivity $\rho \sim T^{-1/2}$ and the Hall coefficient $R_{\mathrm{H}}\sim T^{-1}$ over the wide temperature range of about two order of magnitude below $\sim 30$ K, which can be explained as a combined effect of the temperature dependences of carrier density and carrier scattering by spin fluctuation. An anomaly related with the phase transition has been clearly observed in the transport properties, from which the $H-T$ phase diagram is determined up to 14 T. Taking into account the small entropy change, the phase transition is most probably the spin density wave one. Both the electrical resistivity and Hall resistivity at 0.3 K is largely suppressed about an order of magnitude by magnetic fields above $\sim 3$ T, suggesting a drastic change of electronic structure and a suppression of spin fluctuations under magnetic fields.

arXiv comment7 pages, 6 figures

References in corpus (3)

• Anomalous heavy-fermion and ordered states in the filled skutterudite PrFe4P12
• Fermi surface of the heavy fermion superconductor PrOs${}_4$Sb${}_{12}$
• Exotic Heavy Fermion State in the Filled Skutterudite PrFe${}_4$P${}_{12}$ Uncovered by the de Haas-van Alphen Effect

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• Ordered Phases and Quantum Criticality in Cubic Heavy Fermion Compounds
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• Exotic Kondo-hole band resistivity and magnetoresistance of Ce${}_{1-x}$La${}_x$Os${}_4$Sb${}_{12}$ alloys
• Distinct Kondo Screening Behaviors in Heavy Fermion Filled Skutterudites with 4f1 and 4f2 Configurations
• Fermi-surface topologies and low-temperature phases of the filled Skutterudite compounds CeOs${}_4$Sb${}_{12}$ and NdOs${}_4$Sb${}_{12}$
• Calculation of Optical Conductivity, Resistivity and Thermopower of Filled Skutterudite CeRu${}_4$Sb${}_{12}$ based on a Realistic Tight-binding Model with Strong Correlation
• Interaction effects in mixed-valent Kondo insulators
• Collapse of the $G{d}^{3+}$ ESR fine structure throughout the coherent temperature of the Gd-doped Kondo Semiconductor $CeF{e}_4{P}_{12}$
• Magnetic properties of a Kondo insulator with RKKY interaction: Extended dynamical mean field study
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• Anomalous magnetic phase diagram in low-carrier two-band systems and possible application to CeOs4Sb12
• Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs${}_4$Sb${}_{12}$