Effects of excess oxygen content on the hole-carrying CuO2-layers in Tl2(Ba1-xSrx)2Ca2Cu3Oy superconducting oxides

被引：7
作者：
Idemoto, Y
Matsuzawa, M
Koura, N
Takeuchi, K
Richardson, JW
Loong, CK
机构：
[1] Tokyo Univ Sci, Fac Sci & Technol, Dept Pure & Appl Chem, Noda, Chiba 2788510, Japan
[2] Argonne Natl Lab, Div Intense Pulsed Neutron Source, Argonne, IL 60439 USA
来源：
SOLID STATE COMMUNICATIONS | 2004年 / 131卷 / 08期
关键词：
High-T-c superconductors; crystal structure and symmetry; valence; neutron diffraction;
D O I：
10.1016/j.ssc.2004.06.017
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The effects of oxygen doping on the hole-carrying CuO2-layers in Tl-2(Ba1-xSrx)(2)Ca2Cu3Oy were studied by combined chemical and valence analysis, T-c measurements and neutron diffraction. The highest T-c is characterized by an optimal excess oxygen content, Deltay, dichotomizing the under- and over-doped regions for each Sr concentration. While the average TI valence is close to 3.0 and independent of Deltay, the average Cu valence shows a linear dependence with Deltay. An increase of the flatness of the CuO2 plane, characterized by the O(2)-Cu(2)-O(2) bond angle of similar to176degrees, was observed at the optimal Deltay. (C) 2004 Elsevier Ltd. All rights reserved.
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收藏
页码：513 / 517
页数：5
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