R2BA4CU7O15-DELTA - A 92-K BULK SUPERCONDUCTOR

被引：68

作者：

TALLON, JL ^{[1
]}

POOKE, DM ^{[1
]}

BUCKLEY, RG ^{[1
]}

PRESLAND, MR ^{[1
]}

BLUNT, FJ ^{[1
]}

机构：

[1] UNIV CAMBRIDGE,SUPERCONDUCT INTERDISCIPLINARY RES CTR,CAMBRIDGE CB3 0HE,ENGLAND

来源：

PHYSICAL REVIEW B | 1990年 / 41卷 / 10期

关键词：

D O I：

10.1103/PhysRevB.41.7220

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Superconductivity is investigated in R2Ba4Cu7O15- (R=Y or Er) as a function of oxygen stoichiometry. High-quality single-phase ceramic samples prepared at 869°C in oxygen at one atmosphere were annealed under various oxygen partial pressures and temperatures then rapidly quenched into liquid nitrogen to fix the value of. Tc was found to decrease monotonically with from a maximum of 92 K when =0, to a minimum of 30 K when =10. The normal-state carrier concentration has a one-to-one correspondence with. There is no significant difference between the oxygen unloading curves for as a function of temperature and pressure for Y2Ba4Cu7O15- and YBa2Cu3O7-; i.e., the unloading in the latter is twice that of the former. The volume change per oxygen vacancy is 3.1 per formula unit compared to 3.6 for YBa2Cu3O7-. The material remains orthorhombic for all values of. © 1990 The American Physical Society.

引用

页码：7220 / 7223

页数：4

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