Title
Dynamics of the superconducting condensate in the presence of a magnetic field : channelling of vortices in superconducting strips at high currentsDynamics of the superconducting condensate in the presence of a magnetic field : channelling of vortices in superconducting strips at high currents
Author
Faculty/Department
Faculty of Sciences. Biology
Faculty of Sciences. Physics
Research group
Condensed Matter Theory
Department of Physics
Department of Biology
Publication type
article
Publication
Amsterdam,
Subject
Physics
Source (journal)
Physica: C: superconductivity. - Amsterdam
Volume/pages
404(2004):1-4, p. 400-404
ISSN
0921-4534
ISI
000221211500074
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
On the basis of the time-dependent Ginzburg-Landau equation we studied the dynamics of the superconducting condensate in a wide two-dimensional sample in the presence of a perpendicular magnetic field and applied current. We could identify two critical currents: the current at which the pure superconducting state becomes unstable (J(c2)(1)) and the current at which the system transits from the resistive state to the superconducting state (J(c1) < J(c2)). The current J(c2) decreases monotonically with external magnetic field, while J(c1) exhibits a maximum at H*. For sufficient large magnetic fields the hysteresis disappears and J(c1) = J(c2) = Jc. In this high magnetic field region and for currents close to Jc the voltage appears as a result of the motion of separate vortices. With increasing current the moving vortices form,channels' with suppressed order parameter along which the vortices can move very fast. This leads to a sharp increase of the voltage. These 'channels' resemble in some respect the phase slip lines which occur at zero magnetic field. (C) 2004 Elsevier B.V. All rights reserved.
E-info
https://repository.uantwerpen.be/docman/iruaauth/345295/1281357.pdf
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