Optical study of high- t c superconductors and related oxides
Optical study of high- t c superconductors and related oxides
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高温超导体及相关氧化物的光学研究
DOI：
10.1016/0022-3697(95)00261-8
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发表时间：
1995
影响因子：
4
通讯作者：
S. Uchida
中科院分区：
文献类型：
--
作者：
H. Eisaki;S. Uchida
对二维和一维Cu和Ni氧化物La 2-xSrxCuO 4、La 2-xSrxNiO 4和Y2-xCaxBaNiO 5的光学反射率进行了测量，重点关注掺杂引起的变化。在母体化合物中，光学光谱主要由从O2 p价带到上Hubbard带的激发决定。在掺杂空穴时，在这些系统中常见的是光谱权重到低能激发的转移。然而，转移的光谱权重的轮廓显示出显着的材料依赖性和各向异性。根据实验结果，我们讨论了这些量子自旋流体中空穴的轨道特性和电荷动力学。
Optical reflectivity measurements have been carried out on the two- and one-dimensional Cu and Ni oxides, La2 − xSrxCuO4, La2 − xSrxNiO4and Y2 − xCaxBaNiO5with focus on the doping-induced changes. In the parent compounds, the optical spectra are dominated by the excitations from the O2p valence band to the upper Hubbard band. Upon doping holes, the transfer of the spectral weight into the low-energy excitations is commonly seen in these systems. However, the profile of the transferred spectral weight shows remarkable material dependence and anisotropy. We discuss the orbital character and the charge dynamics of the holes doped into these quantum spin fluids based on the experimental results.