Magnetoresistance sign change in superconducting films with geometrical edge barrier

被引：0

作者：

Maksimov, I. L. ^{[1
]}

Vodolazov, D. Yu. ^{[1
]}

Zaskal'ko, V. V. ^{[1
]}

机构：

[1] Nizhny Novogorod Univ, Dept Theoret Phys, Nizhnii Novgorod 603000, Russia

来源：

PHYSICS LETTERS A | 2007年 / 361卷 / 03期

关键词：

critical current; magnetoresistance; geometrical edge barrier; flux-pinning;

D O I：

10.1016/j.physleta.2006.06.037

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Resistive characteristics of pin-free superconductors with an edge barrier are studied. A model system representing an infinitely long strip of finite width W and thickness d << W is analysed. The numerical solution of the Maxwell-London equation derived in the hydrodynamic approach makes it possible to calculate both the voltage-current characteristics and magnetoresistance (MR) R(H). lt is revealed that positive MR behavior (dR/dH > 0) actual within sufficiently low current range I < I* (I* being the crossover current), changes the sign: dR/dH < 0 at I > I*. This is due to asymmetry of the vortex distribution generated by the external magnetic field. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：257 / 260

页数：4

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