Low density approach to the Kondo-lattice model
Strongly Correlated Electrons
2009-11-07 v1
Abstract
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.
Keywords
Cite
@article{arxiv.cond-mat/0107083,
title = {Low density approach to the Kondo-lattice model},
author = {W. Nolting and G. G. Reddy and A. Ramakanth and D. Meyer},
journal= {arXiv preprint arXiv:cond-mat/0107083},
year = {2009}
}
Comments
11 pages, 7 figures, accepted by PRB