The influence of structure disorder on mean atomic momentum fluctuations and a spin-wave spectrum

Details The influence of structure disorder on mean atomic momentum fluctuations and a spin-wave spectrum The influence of structure disorder on mean atomic momentum fluctuations and a spin-wave spectrum

1995-02-10

arxiv.org/abs/cond-mat/9502042v1

Physics

Condensed Matter

5 Latex pages, to appear in JMMM

Scientific paper

The relation between atomic momenta fluctuations and density fluctuations is obtained in frames of mean-field approximation. Using two-time temperature Green functions within Tyablikov approximation the equations for spin excitation energy and damping are obtained. The asymptotics of energy and damping in the long-wave limit are investigated and the anomalous behaviour of spin-wave stiffness constant is discussed.

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