Spin wave theory of double exchange ferromagnets

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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, JH, 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.

Original languageEnglish
Pages (from-to)3974-3977
Number of pages4
JournalPhysical Review Letters
Issue number17
StatePublished - 24 Apr 2000
Externally publishedYes


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