Bulk new high-Tc superconductors in the (Pb,Cu) Sr2(Ca,Y) Cu2O7-δ and (In,Pb,Cu)Sr2(Ca,Y) Cu2O7-δ systems

被引：0
|
作者：
Liu, R.S. [1 ]
Hu, S.F. [1 ]
Gameson, I. [1 ]
Obertelli, S.D. [1 ]
Edwards, P.P. [1 ]
Jefferson, D.A. [1 ]
Rouillon, I. [1 ]
Hervieu, M. [1 ]
Michel, C. [1 ]
Groult, D. [1 ]
Provos, J. [1 ]
Raveau, B. [1 ]
机构：
[1] Univ of Cambridge, Cambridge, United Kingdom
来源：
Physica C: Superconductivity and its Applications | 1991年 / 190卷 / 1-2期
关键词：
Ceramic Materials - Indium Compounds - Lead Compounds;
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学科分类号：
摘要：
Bulk superconductivity was observed in the systems (Pb0.75 Cu0.25)Sr2(Ca1-xYx)Cu2O7 -δ and (InyPb0.75-yCu0.25)Sr2 (Ca0.5Y0.5)Cu2 O7-δ. With decreasing x in (Pb0.75Cu0.25)Sr2 (Ca1-xYx)Cu2O7-δ, Tc increases up to 55 K at x = 0.1; however this specimen is multiphasic with superconducting Meissner volume fraction of ca. 1.5%. In contrast, the sample with x=0.5 is nearly single phase and has a lower Tc (45 K) and a high superconducting Meissner volume fraction ca. 20.2%. An increase of the indium doping in (InyPb0.75-y Cu0.25 Sr2(Ca0.5Y0.5)Cu2O7-δ, 0 &le y &le 0.2, results in; n increase in the superconducting transition temperature from 45 K for y=0, to 60 K for y=0.2.
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页码：99 / 101
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