Collective Kondo effect in the Anderson-Hubbard lattice
arXiv:cond-mat/9611165 · doi:10.1016/S0921-4526(96)00601-1
Abstract
The periodic Anderson model is extended by switching on a Hubbard U for the conduction electrons. We use the Gutzwiller variational method to study the nearly integral valent limit. The lattice Kondo energy contains the U-dependent chemical potential of the Hubbard subsystem in the exponent, and the correlation-induced band narrowing in the prefactor. Both effects tend to suppress the Kondo scale, which can be understood to result from the blocking of hybridization. At half-filling, we find a Brinkman-Rice-type transition from a Kondo insulator to a Mott insulator.
8 pages (latex) To appear in Physica B
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