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- W2044484889 abstract "We consider a stoichiometric metallic Anderson lattice with orbital degeneracy and finite U. The correlations in the f shell are formulated in terms of a complete set of ``auxiliary bosons,'' generalizing in this way Kotliar and Ruckenstein's approach for the Hubbard model to arbitrary electronic configurations. A Gutzwiller type of mean-field approximation is introduced for the case where the occupancy of the ${mathit{f}}^{mathit{n}}$ configurations for n>2 is excluded. The occupation probabilities are discussed as a function of U and the f-level position. For sufficiently large U the paramagnetic solution becomes unstable towards ferromagnetism. This instability is suppressed with increasing orbital degeneracy. The case of a Kondo insulator with electron-hole symmetry is also discussed in mean-field theory." @default.
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- W2044484889 date "1993-03-01" @default.
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- W2044484889 title "Slave-boson mean-field theory of the Anderson lattice with finite<i>U</i>and orbital degeneracy" @default.
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- W2044484889 doi "https://doi.org/10.1103/physrevb.47.5095" @default.
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