Raman Scattering by Magnons in Rare Earth Metals
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概要
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A theory of light scattering in a magnetic metal using the spin-dependent electric polarizability is developed and is applied to Raman scattering by magnons in heavy rare earth metals. An important mechanism for one- and two-magnon scatterings arises from the coupling of radiation field with the 4<I>f</I> localized moments via spin-orbit interaction. There are also indirect mechanisms in which electric polarizability of the conduction electrons are modulated by the <I>s</I>–<I>f</I> exchange interaction. Contributions of these mechanisms to the spin-dependent polarizability are estimated. We present calculations of the scattering symmetries and intensities for one- and two-magnon processes in systems with ferro-magnetic, spiral and conical spin structures, with application to Tb and Dy, assuming the first mechanism is predominant. In the cases of spiral and conical structures the magnons with wave vectors ±<B>k</B><SUB>0</SUB> and ±2<B>k</B><SUB>0</SUB> are excited, where <B>k</B><SUB>0</SUB> is the wave vector describing the periodicity of the static spin arrangement.
- 社団法人 日本物理学会の論文
社団法人 日本物理学会 | 論文
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