Local phase separation in Tl-based oxide superconductors

被引：22

作者：

Conradson, SD ^{[1
]}

DeLeon, JM ^{[1
]}

Bishop, AR ^{[1
]}

机构：

[1] CTR INVEST & ESTUDIOS AVANZADOS, MERIDA 97310, YUCATAN, MEXICO

来源：

JOURNAL OF SUPERCONDUCTIVITY | 1997年 / 10卷 / 04期

关键词：

phase separation; thallium cuprates; XAFS;

D O I：

10.1007/BF02765713

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We present the results of the analysis of Cu K-edge X-ray absorption fine structure (XAFS) on Tl2Ba2CUO6, which show a complex Cu-O pair distribution function with multiple Cu-O bondlengths in the CuO2 planes, implying local phase separation in this material. Based on these results we propose a model of the local structure of these Tl-based superconductors. We present the formalism used to extract a pair distribution function from XAFS from a model interatomic potential, associating a dynamic time scale to fluctuations between different bond lengths. These copper-oxygen bondlengths are compared with those found in Bi2Sr2CaCu2O8+y, La1.85Sr0.15Cu2O4, and YBa2Cu3O7.

引用

页码：329 / 332

页数：4

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