EFFECTS OF LI DOPING ON THE SUPERCONDUCTING PROPERTIES OF BI-BASED SUPERCONDUCTING WHISKERS

被引：20

作者：

MATSUBARA, I

OGURA, T

YAMASHITA, H

KINOSHITA, M

HASHIMOTO, Y

KAWAI, T

机构：

[1] OSAKA ELECTROCOMMUN UNIV,NEYAGAWA,OSAKA 572,JAPAN

[2] OSAKA UNIV,INST SCI & IND RES,IBARAKI,OSAKA 567,JAPAN

来源：

PHYSICA C | 1992年 / 201卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(92)90108-O

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The effects of Li doping on the superconductivity of Bi-based superconducting whiskers have been investigated. The Li doping is effective in increasing T(c) of both the Bi2Sr2CaCu2Ox (2212) and Bi2Sr2Ca2Cu3Ox (2223) whiskers. The Li-doped 2212 whiskers show a T(c) at 82 K, which is higher than that of the undoped 2212 whiskers by 5 K. The Li-doped and undoped 2223 whiskers have been prepared by the Conversion by Annealing in Powder (CAP) method. An enhancement of T(c) by 1.2 K is achieved by Li doping of the 2223 whiskers. The T(c) of the 2223 phase is commonly accepted to be lowered by a reduction of hole concentration, which is opposite to the situation of the 2212 phase. Therefore, the mechanism of the enhancement of T(c) is not due to the optimization of the hole concentration. From the compositional analysis and the measurement of the c-axis lattice parameter, the Li doping is thought to be effective in increasing the Sr/Ca ratio for both kinds of whiskers, which causes the enhancement of T(c).

引用

页码：83 / 94

页数：12

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