The Kondo-Hubbard model at half-filling

Details The Kondo-Hubbard model at half-filling The Kondo-Hubbard model at half-filling

1998-08-18

arxiv.org/abs/cond-mat/9808189v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, Proceedings of SCES98/Paris

Scientific paper

10.1016/S0921-4526(98)01172-7

We have analyzed the antiferromagnetic (J>0) Kondo-Hubbard lattice with the band at half-filling by means of a perturbative approach in the strong coupling limit, the small parameter is an arbitrary tight-binding band. The results are valid for any band shape and any dimension. We have obtained the energies of elementary charge and spin excitations as well as the magnetic correlations in order to elucidate the magnetic and charge behavior of the Kondo lattice at half-filling. Finally, we have briefly analyzed the ferromagnetic case (J<0), which is shown to be equivalent to an effective antiferromagnetic Heisenberg model.

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