OXYGEN DEFICIENCY IN THE SUPERCONDUCTING OXIDES (LA1-XMX)2CUO4 (M = SR, BA)

被引：41

作者：

TAKAYAMAMUROMACHI, E ^{[1
]}

RICE, DE ^{[1
]}

机构：

[1] UNIV DELAWARE,DEPT CHEM ENGN,NEWARK,DE 19716

来源：

PHYSICA C | 1991年 / 177卷 / 1-3期

关键词：

D O I：

10.1016/0921-4534(91)90318-S

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Oxygen deficiency in the (La1-xMx)2CuOy (M = Sr, Ba) system was determined by thermogravimetric analysis. The oxygen-defect concentration becomes minimal after annealing in 1 atm of O2, i.e. y is very close to 4.0 over the range of composition x < 0.15 for both the Sr- and Ba-doped systems. In PO2 = 10(-3) atm, significant oxygen defects are incorporated and the maximum defect-concentration is nearly the same in the two systems. Oxygen defects have usually had a very large negative effect on superconductivity. In two Ba-doped samples with x = 0.0625 and x = 0.065, however, T(c) increases with increasing defect-concentration. These two compounds transform to a low-temperature tetragonal phase near 60 K which has been suggested to suppress superconductivity. However, this transformation temperature becomes higher with increasing oxygen defects, hence with increasing T(c) casting doubt on the previous suggestion.

引用

页码：195 / 206

页数：12

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