Slave-boson mean-field theory of the Anderson lattice with finite [ital U] and orbital degeneracy
- Department of Physics and Center for Materials Research and Technology, Florida State University, Tallahassee, Florida 32306 (United States)
We consider a stoichiometric metallic Anderson lattice with orbital degeneracy and finite [ital U]. The correlations in the [ital 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 [ital f][sup [ital n]] configurations for [ital n][gt]2 is excluded. The occupation probabilities are discussed as a function of [ital U] and the [ital f]-level position. For sufficiently large [ital 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.
- DOE Contract Number:
- FG05-91ER45443
- OSTI ID:
- 6707664
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Vol. 47:9; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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