LOCAL MAGNETIC-RELAXATION IN HIGH-TEMPERATURE SUPERCONDUCTORS

被引：99

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.

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页码：2404 / 2407

页数：4

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