Calculation of Optical Conductivity, Resistivity and Thermopower of Filled Skutterudite CeRu${}_4$Sb${}_{12}$ based on a Realistic Tight-binding Model with Strong Correlation

Abstract

The filled-skutterudite compound CeRu${}_4$Sb${}_{12}$ shows a pseudo-gap structure in the optical conductivity spectra similar to the Kondo insulators, but metallic behavior below 80 K. The resistivity shows a large peak at 80 K, and the Seebeck coefficient is positive and also shows a large peak at nearly the same temperature. In order to explain all these features, a simplified tight-binding model, which captures the essential features of the band calculation, is proposed. Using this model and introducing the correlation effect within the framework of the dynamical mean field approximation and the iterative perturbation theory, the temperature dependences of the optical conductivity, resistivity and the Seebeck coefficient are calculated, which can explain the experiments.

4 pages, 6 figures

References in corpus (6)

• Transport properties in CeOs${}_4$Sb${}_{12}$: Possibility of the ground state being semiconducting
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• Anomalous Metal-Insulator Transition in Filled Skutterudite CeOs${}_4$Sb${}_{12}$
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Cited by in corpus (2)

• Optical Conductivity and Electronic Structure of CeRu4Sb12 under High Pressure
• Optical and magnetic excitations in the underscreened quasi-quartet Kondo lattice