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.

引用

页码：2404 / 2407

页数：4

共 22 条

[11]

GESHKENBEIN VB, 1989, ZH EKSP TEOR FIZ, V68, P639

[12] RELATIONSHIP BETWEEN CRYSTAL-GROWTH AND PHYSICAL-PROPERTIES IN THE HIGH-TEMPERATURE SUPERCONDUCTOR YBA2CU3O7-DELTA [J].

HOLTZBERG, F ;

FEILD, C .

JOURNAL OF CRYSTAL GROWTH, 1990, 99 (1-4) :915-921

[13] DYNAMICS OF INTERFACES AND DISLOCATIONS IN DISORDERED MEDIA [J].

IOFFE, LB ;

VINOKUR, VM .

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1987, 20 (36) :6149-6158

[14] MAGNETIC-RELAXATION CLOSE TO TC IN YBA2CU3O7 CRYSTAL [J].

KONCZYKOWSKI, M ;

MALOZEMOFF, AP ;

HOLTZBERG, F .

PHYSICA C, 1991, 185 :2203-2204

[15] DEPENDENCE OF FLUX-CREEP ACTIVATION-ENERGY UPON CURRENT-DENSITY IN GRAIN-ALIGNED YBA2CU3O7-X [J].

MALEY, MP ;

WILLIS, JO ;

LESSURE, H ;

MCHENRY, ME .

PHYSICAL REVIEW B, 1990, 42 (04) :2639-2642

[16] FLUX-PENETRATION AND OVERCRITICAL CURRENTS IN FLAT SUPERCONDUCTORS WITH IRRADIATION-ENHANCED EDGE PINNING - THEORY AND EXPERIMENT [J].

SCHUSTER, T ;

INDENBOM, MV ;

KUHN, H ;

BRANDT, EH ;

KONCZYKOWSKI, M .

PHYSICAL REVIEW LETTERS, 1994, 73 (10) :1424-1427

[17] LONG-TERM NONLOGARITHMIC MAGNETIC-RELAXATION IN SINGLE-CRYSTAL YBA2CU3O7 SUPERCONDUCTORS [J].

THOMPSON, JR ;

SUN, YR ;

HOLTZBERG, F .

PHYSICAL REVIEW B, 1991, 44 (01) :458-461

[18] NONLINEAR CURRENT DIFFUSION IN TYPE-II SUPERCONDUCTORS [J].

VANDERBEEK, CJ ;

NIEUWENHUYS, GJ ;

KES, PH ;

SCHNACK, HG ;

GRIESSEN, R .

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 1992, 197 (3-4) :320-336

[19]

ZELDOV E, 1994, PHYS REV B, V49, P9802, DOI 10.1103/PhysRevB.49.9802

[20] FLUX CREEP CHARACTERISTICS IN HIGH-TEMPERATURE SUPERCONDUCTORS [J].

ZELDOV, E ;

AMER, NM ;

KOREN, G ;

GUPTA, A ;

MCELFRESH, MW ;

GAMBINO, RJ .

APPLIED PHYSICS LETTERS, 1990, 56 (07) :680-682

← 1 2 3 →