HOLE DISTRIBUTION IN YBACUO SYSTEM FROM THE ANALYSIS OF CU 2P-XPS, CU 2P-XAS AND O 1S-XAS

被引:14
作者
SEINO, Y
OKADA, K
KOTANI, A
机构
[1] Department of Physics, Faculty of Science, Tohoku University
关键词
D O I
10.1143/JPSJ.59.1384
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We analyze the polarization dependence of the Cu 2p-XAS and the Cu 2p-XPS observed in the YBa2Cu3O7-δ system. To take into account the nonequivalent Cu sites in YBa2Cu3O7, we use a model where the impurity Anderson model and a CuO4 cluster model are linked, where the former and the latter describe the CuO2 plane and the CuO chain, respectively, For YBa2Cu3O6.5, the CuO4 cluster is replaced by a CuO3 cluster. For 0<δ<0.5, the spectrum is obtained by a superposition of the spectra for δ=0 and 0.5. Obtained results quantitatively reproduce the experimental results of Cu 2p-XAS, and the electron configuration of the ground state obtained from our spectral analysis suggests that extra holes will enter both the O sites in the CuO chains and the CuO2 layers. This picture is also supported by the analysis of the polarization dependence in the O ls-XAS. © 1990, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.
引用
收藏
页码:1384 / 1396
页数:13
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