THERMALLY ACTIVATED DEPINNING OF FLUX LINES FROM COLUMNAR DEFECTS

被引：12

作者：

KRAMER, A ^{[1
]}

KULIC, ML ^{[1
]}

机构：

[1] MAX PLANCK INST FESTKORPERFORSCH,D-70569 STUTTGART,GERMANY

来源：

PHYSICAL REVIEW B | 1993年 / 48卷 / 13期

关键词：

D O I：

10.1103/PhysRevB.48.9673

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The dynamics of a fluctuating vortex in the presence of a columnar defect is described with a functional Fokker-Planck equation. Within this picture thermally activated depinning due to an external electric current perpendicular to the defect axis corresponds to a nonzero probability current over a saddle point u1 of the energy in configuration space. If the energy barrier is large enough this probability current may be calculated summing over all fluctuations orthogonal to the direction of steepest descent at u1. This gives the prefactor in the Arrhenius law to be proportional to j5/2T-1/2 for the escape rate of a pinned vortex, and to j3/2T-1/2 for the resistivity rho.

引用

页码：9673 / 9676

页数：4

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