Low Temperature Magnetic Properties of the Double Exchange Model
Condensed Matter
2009-10-28 v1
Abstract
We study the {\it ferromagnetic} (FM) Kondo lattice model in the strong coupling limit (double exchange (DE) model). The DE mechanism proposed by Zener to explain ferromagnetism has unexpected properties when there is more than one itinerant electron. We find that, in general, the many-body ground state of the DE model is {\it not} globally FM ordered (except for special filled-shell cases). Also, the low energy excitations of this model are distinct from spin wave excitations in usual Heisenberg ferromagnets, which will result in unusual dynamic magnetic properties.
Keywords
Cite
@article{arxiv.cond-mat/9606148,
title = {Low Temperature Magnetic Properties of the Double Exchange Model},
author = {Jun Zang and H. Röder and A. R. Bishop and S. A. Trugman},
journal= {arXiv preprint arXiv:cond-mat/9606148},
year = {2009}
}
Comments
5 pages, RevTeX, 5 Postscript figures included