The RKKY interactions and the Mott Transition

Details The RKKY interactions and the Mott Transition The RKKY interactions and the Mott Transition

1998-12-11

arxiv.org/abs/cond-mat/9812185v1

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 10 figures; to appear in Phys. Rev. B (1999)

Scientific paper

10.1103/PhysRevB.59.6846

A two-site cluster generalization of the Hubbard model in large dimensions is examined in order to study the role of short-range spin correlations near the metal-insulator transition (MIT). The model is mapped to a two-impurity Kondo-Anderson model in a self-consistently determined bath, making it possible to directly address the competition between the Kondo effect and RKKY interactions in a lattice context. Our results indicate that the RKKY interactions lead to qualitative modifications of the MIT scenario even in the absence of long range antiferromagnetic ordering.

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