Low density approach to the Kondo-lattice model

Details Low density approach to the Kondo-lattice model Low density approach to the Kondo-lattice model

2001-07-04

arxiv.org/abs/cond-mat/0107083v1

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 7 figures, accepted by PRB

Scientific paper

10.1103/PhysRevB.64.155109

We propose a new approach to the (ferromagnetic) Kondo-lattice model in the low density region, where the model is thought to give a reasonable frame work for manganites with perovskite structure exhibiting the "colossal magnetoresistance" -effect. Results for the temperature- dependent quasiparticle density of states are presented. Typical features can be interpreted in terms of elementary spin-exchange processes between itinerant conduction electrons and localized moments. The approach is exact in the zero bandwidth limit for all temperatures and at T=0 for arbitrary bandwidths, fulfills exact high-energy expansions and reproduces correctly second order perturbation theory in the exchange coupling.

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