Abstract
Kondo insulators such as Ce 3 Bi 4 Pt 3 and CeNiSn are small-gap semiconductor compounds. We consider a stoichiometric Kondo insulator described by the symmetric Anderson lattice without orbital degeneracy and on average two electrons per site. We use a Gutzwiller-type mean-field approximation formulated in terms of four slave bosons per site in analogy with Kotliar and Ruckenstein's approach for the Hubbard model. A hybridization gap on the scale of the Kondo temperature opens in the paramagnetic phase, giving rise to the semiconducting properties at low temperatures
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