EVIDENCE FOR A TIME-DEPENDENT CROSSOVER FROM SURFACELIKE TO BULK-LIKE FLUX RELAXATION IN YBA2CU3O7-DELTA

被引：28
|
作者：
WEIR, ST
NELLIS, WJ
DALICHAOUCH, Y
LEE, BW
MAPLE, MB
LIU, JZ
SHELTON, RN
机构：
[1] UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093
[2] UNIV CALIF DAVIS,DAVIS,CA 95616
来源：
PHYSICAL REVIEW B | 1991年 / 43卷 / 04期
关键词：
D O I：
10.1103/PhysRevB.43.3034
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
dc flux-relaxation experiments were performed on single crystals of YBa2Cu3O7-delta at low magnetic fields. A sharp, time-dependent crossover in the logarithmic magnetization decay rate was observed in two different crystals. Consideration of the size dependence of the relaxation rate in one of the YBa2Cu3O7-delta crystals suggests that the crossover in the relaxation rate is due to a transition from surface-controlled to bulk-controlled relaxation behavior. Our observations seem to indicate that, over a certain range of temperatures and magnetic fields, surface pinning may play a significant role in the flux-relaxation behavior of YBa2Cu3O7-delta.
引用
收藏
页码：3034 / 3041
页数：8
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