Title
Fractional and negative flux penetration in mesoscopic superconducting disksFractional and negative flux penetration in mesoscopic superconducting disks
Author
Faculty/Department
Faculty of Sciences. Physics
Research group
Condensed Matter Theory
Department of Physics
Publication type
article
Publication
Amsterdam,
Subject
Physics
Source (journal)
Physica: C: superconductivity. - Amsterdam
Volume/pages
369(2002):1-4, p. 158-164
ISSN
0921-4534
ISI
000174200000023
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
The one vortex entry in a superconducting disk is investigated within the non-linear Ginzburg-Landau theory near the first critical field. We find that in mesoscopic superconducting disks the magnetic flux enters with fractions of one flux quantum phi(0) = ch/2e. For disks with a very smooth surface it is possible to drive the Meissner state so far into the metastable region that at the vortex entry a net amount of flux is expelled from the superconductor. We show that the magnetic field for flux entry is very sensitive to indentations of the disk surface and only weakly to bulges. On the other hand the flux exit field is practically insensitive to such geometrical surface defects. Our results are in agreement with recent experimental findings. (C) 2001 Elsevier Science B.V. All rights reserved.
E-info
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