Spin and orbital characters of excitations in iron arsenide superconductors revealed by simulated resonant inelastic x-ray scattering
Spin and orbital characters of excitations in iron arsenide superconductors revealed by simulated resonant inelastic x-ray scattering
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DOI：
10.1103/physrevb.84.020511
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发表时间：
2011-04
影响因子：
3.7
通讯作者：
E. Kaneshita;K. Tsutsui;T. Tohyama
中科院分区：
文献类型：
--
作者：
E. Kaneshita;K. Tsutsui;T. Tohyama
在五带巡游模型的基础上，我们从理论上研究了砷化铁超导体母态中与自旋自由度耦合的轨道激发。计算的Fe $L_3$边共振非弹性X射线散射（RIXS）谱揭示了涉及几个特定轨道的自旋翻转激发的存在。在实验中可以看到主要由单个轨道分量组成的磁振子激发，尽管它的光谱权重小于自旋翻转的轨道间高能激发。详细的偏振和动量依赖关系也进行了讨论与预测的实验。
We theoretically examine the orbital excitations coupled to the spin degree of freedom in the parent state of the iron-arsenide superconductor, based on the calculation in a five-band itinerant model. The calculated Fe $L_3$-edge resonant inelastic x-ray scattering (RIXS) spectra disclose the presence of spin-flip excitations involving several specific orbitals. Magnon excitations predominantly composed of a single orbital component can be seen in experiments, although its spectral weight is smaller than spin-flipped interorbital high-energy excitations. The detailed polarization and momentum dependence is also discussed with predictions for the experiments.