Slave-boson mean-field theory of the Anderson lattice with finite [ital U] and orbital degeneracy

Journal Article · Sun Feb 28 23:00:00 EST 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.47.5095· OSTI ID:6707664

Dorin, V; Schlottmann, P ^[1]

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1. 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), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 47:9; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

665000* -- Physics of Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BOSONS
CRYSTAL MODELS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
HUBBARD MODEL
KONDO EFFECT
MAGNETIC PROPERTIES
MATHEMATICAL MODELS
MEAN-FIELD THEORY
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY