EFFECT OF RHOMBIC DISTORTION ON THE POLARIZED X-RAY ABSORPTION-SPECTRA IN HIGH-TC SUPERCONDUCTORS

被引：36

作者：

SEINO, Y ^{[1
]}

KOTANI, A ^{[1
]}

BIANCONI, A ^{[1
]}

机构：

[1] UNIV ROME LA SAPIENZA,DEPARTIMENTO FIS,I-00185 ROME,ITALY

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1990年 / 59卷 / 03期

关键词：

D O I：

10.1143/JPSJ.59.815

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We theoretically study the polarization dependence of the Cu 2p-XAS (X-ray absorption spectrum) in high Tc superconductors with the use of a simple CuO4 cluster. We take account of both the Cu 3d(x2-y2) and 3d(3z2-r2) orbitals, and study the effect of a possible rhombic distortion by which the two 3d orbitals are mixed with each other. The polarized XAS is calculated both in the undoped “Cu2+” system and the hole-doped “Cu3+” system. A considerably large intensity ratio between E//c and E⊥c absorption spectra is obtained in the “Cu3+” system as a result of the rhombic distortion, where E and c are directions of the X-ray electric field and the crystalline c-axis, respectively. These results help to explain the increase in the polarized E//c Cu 2/7-XAS white line going from the insulating to the hole-doped phases in Bi-Sr-Ca-Cu-O (2212) systems. © 1990, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.

引用

页码：815 / 818

页数：4

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