Superconductivity in CoSr2(Y1-xCax)Cu2O7+δ

被引：15
|
作者：
Morita, Y [1 ]
Yamauchi, H [1 ]
Karppinen, M [1 ]
机构：
[1] Tokyo Inst Technol, Mat & Struct Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan
来源：
SOLID STATE COMMUNICATIONS | 2003年 / 127卷 / 07期
基金：
日本学术振兴会;
关键词：
high-T-c superconductors; chemical synthesis; high-pressure;
D O I：
10.1016/S0038-1098(03)00486-1
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The roles of aliovalent Ca-II-for-Y-III substitution and high-pressure-oxygen annealing in the process of 'superconducterizing' the Co-based layered copper oxide, CoSr2(Y1-xCax)Cu2O7+delta (Co-1212), were investigated. The as-air-synthesized samples up to x = 0.4 were found essentially oxygen stoichiometric (-0.03 less than or equal to delta less than or equal to 0.00). These samples, however, were not superconducting, suggesting that the holes created by the divalent-for-trivalent cation substitution are trapped on Co in the charge reservoir. Ultra-high-pressure heat treatment carried out at 5 GPa and 500 degreesC for 30 min in the presence of Ag2O2 as an excess oxygen source induced bulk superconductivity in these samples. The highest T-c was obtained for the high-oxygen-pressure treated x = 0.3 sample at similar to40 K. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码：493 / 498
页数：6
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