IRREVERSIBILITY TEMPERATURE AND MEISSNER FRACTION IN HIGH-TEMPERATURE SUPERCONDUCTORS

被引：2
|
作者：
OTA, SB
RAPSON, GP
DEGROOT, PAJ
机构：
[1] Physics Department, Southampton University, Southampton
来源：
PHYSICA B | 1990年 / 165卷
关键词：
D O I：
10.1016/S0921-4526(09)80158-0
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Low field (<30mT) magnetisation measurements have been carried out on BSCCO and YBCO ceramics and on BSCCO single crystals. The Meissner fraction (MF) has been found to obey a power law: MF ∝ Hi-m where Hi is the internal field. The value of m is different for the different samples. The field range over which the power law holds and m increase with temperature. The irreversibility temperature (Ti) determined by a fixed criterion δM, obeys the relation: (Tc-Ti) ∝ Hin. In the case of BSCCO, n increases as δM increases. We argue that present flux pinning models do dot explain these results. © 1990, Elsevier Science Publishers B.V. (North-Holland). All rights reserved.
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页码：1145 / 1146
页数：2
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