MAGNETIC-RELAXATION AND IRREVERSIBILITY IN A SUPERCONDUCTING TL2BA2CA2CU3O10+X THIN-FILM

被引：22

作者：

CHAN, VK ^{[1
]}

LIOU, SH ^{[1
]}

机构：

[1] UNIV NEBRASKA,CTR MAT RES & ANAL,LINCOLN,NE 68588

来源：

PHYSICAL REVIEW B | 1992年 / 45卷 / 10期

关键词：

D O I：

10.1103/PhysRevB.45.5547

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magnetic relaxation in a Tl2Ba2Ca2Cu3O10 +/- x superconducting thin film has been measured at a range of temperatures (5-70 K) and field strengths (500-5000 Oe). Measurements reveal that the relaxation obeys a logarithmic time dependence in the time interval 2000 s < t < 12 000 s. The relaxation rate is both temperature and field dependent. The average pinning potential U* calculated from the relationship U* = kT/[(-1/M(i))dM/d lnt] is in the range 20-70 meV, which is similar to those of Y-Ba-Cu-O and (Bi,Pb)-Sr-Ca-Cu-O. The anomalous increase of U* at higher temperature is found to be closely related to the irreversibility line.

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页码：5547 / 5552

页数：6

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