Excitonic dispersion of the intermediate spin state in LaCoO3 revealed by resonant inelastic x-ray scattering
Excitonic dispersion of the intermediate spin state in LaCoO3 revealed by resonant inelastic x-ray scattering
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DOI：
10.1103/physrevb.98.035149
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发表时间：
2018-07-31
影响因子：
3.7
通讯作者：
de Groot, Frank M. F.
中科院分区：
文献类型：
--
作者：
Wang, Ru-Pan;Hariki, Atsushi;de Groot, Frank M. F.
我们报告了 20 K 下 LaCoO3 上的 Co L-3 边缘共振非弹性 X 射线散射。我们观察到具有相当大色散的激发，我们将其识别为中间自旋 (IS) 态。将 IS 态视为在低自旋背景上传播的移动激子的理论计算支持了这一解释。目前的结果表明，迁移率大大降低了布里渊区部分 IS 激发的能量，这使得它们与固定的高自旋激发一起在 LaCoO3 的低能物理中发挥着重要作用。
We report Co L-3-edge resonant inelastic x-ray scattering on LaCoO3 at 20 K. We observe excitations with sizable dispersion that we identify as intermediate-spin (IS) states. Theoretical calculations that treat the IS states as mobile excitons propagating on the low-spin background support the interpretation. The present result shows that mobility substantially reduces the energy of IS excitations in part of the Brillouin zone, which makes them important players in the low-energy physics of LaCoO3 together with immobile high-spin excitations.