Low Temperature Magnetic Properties of the Double Exchange Model

Details Low Temperature Magnetic Properties of the Double Exchange Model Low Temperature Magnetic Properties of the Double Exchange Model

1996-06-20

arxiv.org/abs/cond-mat/9606148v1

Physics

Condensed Matter

5 pages, RevTeX, 5 Postscript figures included

Scientific paper

10.1088/0953-8984/9/11/001

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.

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