计算物理 ›› 1995, Vol. 12 ›› Issue (3): 309-314.

• 论文 • 上一篇    下一篇

掺Pr的YBCO体系的EXAFS研究

韩继红, 顾昌鑫   

  1. 复旦大学现代物理研究所, 上海 200433
  • 收稿日期:1993-11-01 修回日期:1994-08-16 出版日期:1995-09-25 发布日期:1995-09-25
  • 基金资助:
    国家教委留学服务中心留学回国人员资助;上海自然科学基金

EXAFS STUDIES OF THE Pr DOPED YBCO SYSTEM

Han Jihong, Gu Changxin   

  1. Fudan Unviersity, Modern Physics Institute, Shanghai 200433
  • Received:1993-11-01 Revised:1994-08-16 Online:1995-09-25 Published:1995-09-25

摘要: 通过对掺Pr的YBCO体系的EXAFS数据计算机分析发现:体系中的O的位置随Pr含量改变发生了变化。CuO2平面曲折度增加,Cu-O链上的O更趋近于CuO2面,Ba-O3间距增大。所有这些变化导致载流子浓度降低和载流子严重局域化,引起超导性发生变化。

关键词: Y1-xPrxBa2Cu3O7-δ 体系, EXAFS分, 超导性

Abstract: EXAFS analyses of YBCO doped with Pr approve that the O position in this system changes with the Pr concentration x. With increasing x, the deformation of CuO2 plane greater, the O in the Cu-O chain nearer CuO2 plane, the distance between Ba and O3 longer. All these tructure changes in the Y1-xPrxBa2Cu3O7-δ system make the carrier density decreas and make the carrier strongly localize, which causes the change of superconductivity.

Key words: Y1-xPrxBa2Cu3O7-δsystem, EXAFS analysis, superconductivity

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