OXYGEN-PRESSURE, THE KEY FACTOR FOR OPTIMIZATION OF SUPERCONDUCTIVITY IN THE 1212-PHASE PB1-XSR2CA0.5Y0.5CU2+XO7+/-DELTA

被引：32

作者：

MAIGNAN, A ^{[1
]}

ROUILLON, T ^{[1
]}

GROULT, D ^{[1
]}

PROVOST, J ^{[1
]}

HERVIEU, M ^{[1
]}

MICHEL, C ^{[1
]}

RAVEAU, B ^{[1
]}

LIU, RS ^{[1
]}

EDWARDS, PP ^{[1
]}

机构：

[1] UNIV CAMBRIDGE,IRC SUPERCONDUCT,CAMBRIDGE CB3 0HE,ENGLAND

来源：

PHYSICA C | 1991年 / 177卷 / 4-6期

关键词：

D O I：

10.1016/0921-4534(91)90503-Q

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The influence of oxygen pressure upon superconducting properties of lead-based 1212 copper oxides Pb1-xSr2Ca0.5Y0.5Cu2+xO7 +/- delta has been investigated as a function of time and annealing temperature. Annealings of (Pb0.7Cu0.3)Sr2Ca0.5Y0.5Cu2O7 +/- delta at 400-degrees-C for 10 h show that this material becomes superconductive as the oxygen pressure reaches 10 bar, the critical temperature being increased from 0 to 29 K. The maximum value of T(c) = 42 K is obtained for an oxygen pressure ranging between 40 and 60 bar. Annealing at 20 bar for 65 h show that T(c) increases up to an annealing temperature of 500-degrees-C and decreases abruptly beyond this temperature.

引用

页码：461 / 468

页数：8

共 13 条

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