Collective Kondo effect in the Anderson-Hubbard lattice

Details Collective Kondo effect in the Anderson-Hubbard lattice Collective Kondo effect in the Anderson-Hubbard lattice

1996-11-21

arxiv.org/abs/cond-mat/9611165v1

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages (latex) To appear in Physica B

Scientific paper

10.1016/S0921-4526(96)00601-1

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.

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