Optical conductivity of filled skutterudites

Abstract

A simple tight-binding model is constructed for the description of the electronic structure of some Ce-based filled skutterudite compounds showing an energy gap or pseudogap behavior. Assuming band-diagonal electron interactions on this tight-binding model, the optical conductivity spectrum is calculated by applying the second-order self-consistent perturbation theory to treat the electron correlation. The correlation effect is found to be of great importance on the description of the temperature dependence of the optical conductivity. The rapid disappearance of an optical gap with increasing temperature is obtained as observed in the optical experiment for Ce-based filled-skutterudite compounds.

6 pages, 7 figures, use jpsj2.cls, to appear in J. Phys. Soc. Jpn. Vol.73, No.10 (2004)

References in corpus (4)

• Optical conductivity of the Kondo insulator YbB_12: Gap formation and low-energy excitations
• Formation Mechanism of Hybridization Gap in Kondo Insulators based on a Realistic Band Model and Application to YbB${}_{12}$
• Correlation Effects on Optical Conductivity of FeSi
• Calculation of Optical Conductivity of YbB${}_{12}$ using Realistic Tight-Binding Model

Cited by in corpus (4)

• Optical Conductivity and Electronic Structure of CeRu4Sb12 under High Pressure
• Anomalous Metal-Insulator Transition in Filled Skutterudite CeOs${}_4$Sb${}_{12}$
• Contrasting pressure evolutions of $f$ electron hybridized states in CeRhIn${}_5$ and YbNi${}_3$Ga${}_9$: an optical conductivity study
• Calculation of Optical Conductivity, Resistivity and Thermopower of Filled Skutterudite CeRu${}_4$Sb${}_{12}$ based on a Realistic Tight-binding Model with Strong Correlation