FLUX-PINNING AND THE IRREVERSIBILITY LINE IN BI2SR2CACU2O8 SINGLE-CRYSTALS

被引：0
|
作者：
ELABBAR, AA
OWERSBRADLEY, JR
MAXWELL, KJ
LEES, J
KING, PJ
BALAKRISHNAN, G
PAUL, DM
机构：
[1] UNIV WARWICK,DEPT PHYS,COVENTRY CV4 7AL,W MIDLANDS,ENGLAND
[2] UNIV NOTTINGHAM,DEPT PHYS,NOTTINGHAM NG7 2RD,ENGLAND
来源：
PHYSICA B | 1994年 / 194卷
关键词：
D O I：
10.1016/0921-4526(94)91443-5
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Measurements of the ac-susceptibility have been used to investigate the irreversibility line (IL) for a Bi2Sr2CaCu2O8 Single crystal. The activation energy, U0, determined from the frequency dependence of the ac-susceptibility, can be related to the IL if one employs the model of thermally activated flux creep. This correlation is clearly demonstrated by the observation of a kink in the IL and the existence of two regions in the U0(H) curve. These results show that for the magnetic field strengths considered in this work, the IL is a depinning line marking a crossover from flux creep to flux flow regimes.
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页码：1887 / 1888
页数：2
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