Copper-related information from the oxygen 1s resonant x-ray emission in low-dimensional cuprates
Copper-related information from the oxygen 1s resonant x-ray emission in low-dimensional cuprates
复制标题
低维铜酸盐中氧 1s 共振 X 射线发射的与铜相关的信息
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
A. Kotani
中科院分区：
文献类型：
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作者：
K. Okada;A. Kotani
采用有限尺寸的团簇模型，研究了低维铜氧化物体系中O 1 s X射线发射谱（XES）的入射和出射光子偏振依赖性.结果表明，O 1 s共振XES提供的信息，铜相关的激发，如铜dd激发和电荷转移（CT）的激发，除了氧本身的激发。特别是，最低能量的CT之间的相邻的CuO 4斑块伴随着张-赖斯单重态的形成。甚至Cu 3d自旋翻转也可以作为非弹性散射峰观察到。因此，O 1 s共振XES可以成为研究氧化物中与金属离子相关的激发的一个很好的工具。
Incident- and outgoing-photon polarization dependences of O 1s x-ray emission spectrum (XES) in low-dimensional cuprate systems are investigated through model calculations using finite-size cluster models which include several copper sites. It is shown that the O 1s resonant XES provides information on the Cu-related excitations such as the Cu dd excitations and the charge-transfer (CT) excitations, in addition to the oxygen proper excitations. In particular, the lowest-energy CT between the neighboring CuO 4 plaquettes accompanies Zhang-Rice singlet formation. Even the Cu 3d spin flip can be observed as an inelastic scattering peak. Thus the O 1 s resonant XES can be a nice tool to investigate metal-ion-related excitations in oxides.