Spin Wave Theory of Double Exchange Ferromagnets

Details Spin Wave Theory of Double Exchange Ferromagnets Spin Wave Theory of Double Exchange Ferromagnets

1999-08-13

arxiv.org/abs/cond-mat/9908202v3

Phys. Rev. Lett. vol. 84, 3974-3977 (2000).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, Latex-Revtex, 2 PostScript figures. Minor revisions, references added. See also cond-mat/9909213

Scientific paper

10.1103/PhysRevLett.84.3974

We construct the 1/S spin-wave expansion for double exchange ferromagnets at T=0. It is assumed that the value of Hund's rule coupling, J_H, is sufficiently large, resulting in a fully saturated, ferromagnetic half-metallic ground state. We evaluate corrections to the magnon dispersion law, and we also find that, in contrast to earlier statements in the literature, magnon-electron scattering does give rise to spin wave damping. We analyse the momentum dependence of these quantities and discuss the experimental implications for colossal magnetoresistance compounds.

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