Magnon Lifetime and Its Effect on Magnon Sideband in MnO

概要

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Lifetime of magnon arising from magnon-magnon interaction is studied for the general helical spin system by spin wave approach using diagrammatic techniques. The antiferromagnetic MnO, whose spin structure can simply be described as a helix with a wave vector 〓=[111]π/a, is taken up, and the energies and lifetimes of magnons with wave vectors along [100], [111] and [110] are calculated as function of temperature. The temperature-dependent line shape of the magnon sideband in MnO corresponding to the transition ^6A_<1g>-^4T_<1g> of the Mn^<2+> ions is studied with the inclusion of magnon lifetime. The calculated results are compared with the observation.
社団法人日本物理学会の論文
1976-10-15