Spin-wave Hamiltonian in double-exchange systems

Details Spin-wave Hamiltonian in double-exchange systems Spin-wave Hamiltonian in double-exchange systems

2002-10-15

arxiv.org/abs/cond-mat/0210333v1

Physica B: Cond. Matter 329-333, 759 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

2 pages, to be published in Physica B (Proc. to LT23)

Scientific paper

10.1016/S0921-4526(02)02503-6

A simple derivation of the effective spin-wave Hamiltonian for a double-exchange system with infinitely large Hund's-rule coupling is demonstrated. The formalism can be applied to models with arbitrary range of hopping as well as those with randomness. The result shows that, within the leading order of the 1/S expansion, one magnon excitation spectrum can be described by the Heisenberg model.

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