LOCAL MAGNETIC-RELAXATION IN HIGH-TEMPERATURE SUPERCONDUCTORS

被引：98
|
作者：
ABULAFIA, Y
SHAULOV, A
WOLFUS, Y
PROZOROV, R
BURLACHKOV, L
YESHURUN, Y
MAJER, D
ZELDOV, E
VINOKUR, VM
机构：
[1] WEIZMANN INST SCI, DEPT CONDENSED MATTER PHYS, IL-76100 REHOVOT, ISRAEL
[2] ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA
来源：
PHYSICAL REVIEW LETTERS | 1995年 / 75卷 / 12期
关键词：
D O I：
10.1103/PhysRevLett.75.2404
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A novel Hall probe array technique is used to measure the spatial distribution and time dependence of the magnetic induction in YBa2Cu3O7-delta crystals. Analysis of the data based on the flux diffusion equation allows a direct, model-independent determination of the local activation energy U and the logarithmic time scale to for flux creep. The results indicate that the spatial variations of U are small (+/-kT) and that U increases logarithmically with time. The time t(0) is inversely proportional to the field and it exhibits a nonmonotonic temperature dependence. These results confirm theoretical predictions based on the logarithmic solution of the flux diffusion equation.
引用
收藏
页码：2404 / 2407
页数：4
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