Y2BA4CU7O15-DELTA AND ITS RELATIONSHIP TO YBA2CU3O7-DELTA AND YBA2CU4O8

被引：5
|
作者：
POOKE, DM [1 ]
TALLON, JL [1 ]
BUCKLEY, RG [1 ]
LORAM, J [1 ]
机构：
[1] UNIV CAMBRIDGE,IRC SUPERCOND,CAMBRIDGE CB3 0HE,ENGLAND
来源：
PHYSICA C | 1991年 / 185卷
关键词：
D O I：
10.1016/0921-4534(91)92084-O
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The phase boundaries for Y2Ba4Cu7O15-delta (2-4-7) are determined for oxygen partial pressures between 0.1 and 60 bar. In contrast to other reports, fully oxygen-loaded 2-4-7 is confirmed to be a 92K superconductor. The high T(c) value is not due to 123 intergrowths. The lower T(c) (approximately 70K) reported by other groups for 2-4-7 probably arises from oxygen disorder as signalled by their lower orthorhombicity. 2-4-7 is slightly underdoped relative to T(c)(max) while 1-2-3 is a little overdoped. The heat capacity anomaly for 2-4-7 is not much less than that for 1-2-3 and 3x that for 1-2-4.
引用
收藏
页码：563 / 564
页数：2
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