Publication
Title
Vortex entry conditions in type-II superconductors. Effect of surface defects
Author
Abstract
The conditions for the vortex entry into type-II superconductors being in the mixed state, are studied by means of both numerical and analytical solution of the Ginzburg-Landau equations. A modulation instability of the superconducting order parameter is shown to occur when the kinematic momentum (or supervelocity) of the condensate reaches a threshold value at the superconductor edge or surface. Due to this instability, vortices start to nucleate at the edge/surface and then penetrate deeper into the sample. It is found that the presence of surface defects causes a noticeable drop of the first penetration field and leads to a qualitative change of the magnetization curve. Based on these results a simple phenomenological model of the edge or surface barrier, taking into account the effect of surface defects, is suggested. (C) 2002 Elsevier Science B.V. All rights reserved.
Language
English
Source (journal)
Physica: C: superconductivity. - Amsterdam
Publication
Amsterdam : 2003
ISSN
0921-4534
Volume/pages
384:1-2(2003), p. 211-226
ISI
000180305800026
Full text (Publisher's DOI)
UAntwerpen
Publication type
Subject
External links
Web of Science
Record
Identification
Creation 12.07.2012
Last edited 04.11.2017