Theory of Orbital Excitation and Resonant Inelastic X-ray Scattering in Manganites
Theory of Orbital Excitation and Resonant Inelastic X-ray Scattering in Manganites
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DOI：
10.1103/physrevb.62.2338
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发表时间：
1998-12
期刊：
影响因子：
--
通讯作者：
S. Ishihara;S. Maekawa
中科院分区：
文献类型：
--
作者：
S. Ishihara;S. Maekawa
从理论上研究了有序锰氧化物中的集体轨道激发--轨道波，静态自旋结构通过自旋自由度与轨道自由度的耦合影响轨道波的色散关系。作为探测色散关系的探针，我们提出了利用共振非弹性X射线散射的两种可能的方法。给出了轨道波散射的跃迁几率公式，计算了几种轨道和自旋结构下结构因子的动量和偏振依赖关系。本文还讨论了在L边情况下观察轨道有序性的弹性X射线散射。
We study theoretically the collective orbital excitation named orbital wave in the orbital ordered manganites.The dispersion relation of the orbital wave is affected by the static spin structure through the coupling between spin and orbital degrees of freedom. As a probe to detect the dispersion relation, we propose two possible methods by utilizing resonant inelastic x-ray scattering. The transition probability of the orbital wave scattering is formulated, and the momentum and polarization dependences of the structure factor are calculated in several types of the orbital and spin structures. The elastic x-ray scattering in the L-edge case to observe the orbital ordering is also discussed.