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
收藏
页码:329 / 332
页数:4
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