Optical conductivity of filled skutterudites

Details Optical conductivity of filled skutterudites Optical conductivity of filled skutterudites

2004-09-07

arxiv.org/abs/cond-mat/0409165v1

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1143/JPSJ.73.2900

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.

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