Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 17, Pages 3974-3977Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.3974
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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 analyze the momentum dependence of these quantities and discuss the experimental implications for colossal magnetoresistance compounds.
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