TRANSPORT ENTROPY IN YBA2CU3O7 - A COMPARISON BETWEEN EPITAXIAL AND POLYCRYSTALLINE THIN-FILMS

被引：33
|
作者：
KOBER, F [1 ]
RI, HC [1 ]
GROSS, R [1 ]
KOELLE, D [1 ]
HUEBENER, RP [1 ]
GUPTA, A [1 ]
机构：
[1] IBM CORP, THOMAS J WATSON RES CTR, DIV RES, YORKTOWN HTS, NY 10598 USA
来源：
PHYSICAL REVIEW B | 1991年 / 44卷 / 21期
关键词：
D O I：
10.1103/PhysRevB.44.11951
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The dissipative behavior in thin films of YBa2Cu3O7-delta has been investigated under the influence of a temperature gradient. By using the sample configuration itself as a thermometer, a method has been developed for the study of flux dynamics in the presence of a temperature gradient. The temperature and magnetic-field dependence of the transport entropy was measured, and the influence of grain boundaries on this quantity was investigated. For an epitaxial YBa2Cu3O7-delta film near T(c), we obtain the value -dH(c2)/dT = 2 +/- 0.5 T/K and the Ginzburg-Landau parameter kappa(GL) = 80 +/-10.
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收藏
页码：11951 / 11959
页数：9
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