Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-03-02
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, LaTeX, 7 PS figures included, uses RevTeX
Scientific paper
10.1103/PhysRevB.58.15528
We study the two-band Hubbard model introduced by Fu and Doniach as a model for FeSi which is suggested to be a Kondo insulator. Using the self-consistent second-order perturbation theory combined with the local approximation which becomes exact in the limit of infinite dimensions, we calculate the specific heat, the spin susceptibility and the dynamical conductivity and point out that the reduction of the energy gap due to correlation is not significant in contrast to the previous calculation. It is also demonstrated that the gap at low temperatures in the optical conductivity is filled up at a rather low temperature than the gap size, which is consistent with the experiment.
Saso Tetsuro
Urasaki Kentaro
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