Title
Second generation of vortex-antivortex states in mesoscopic superconductors: stabilization by artificial pinning Second generation of vortex-antivortex states in mesoscopic superconductors: stabilization by artificial pinning
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Lancaster, Pa ,
Subject
Physics
Source (journal)
Physical review : B : solid state. - Lancaster, Pa, 1970 - 1978
Volume/pages
79(2009) :17 , p. 174508,1-174508,5
ISSN
0556-2805
ISI
000266501100098
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Antagonistic symmetries of superconducting polygons and their induced multivortex states in a homogeneous magnetic field may lead to the appearance of antivortices in the vicinity of the superconducting/normal-state boundary (where mesoscopic confinement is particularly strong). Resulting vortex-antivortex (V-Av) molecules match the sample symmetry but are extremely sensitive to defects and fluctuations and remain undetected experimentally. Here we show that V-Av states can reappear deep in the superconducting state due to an array of perforations in a polygonal setting, surrounding a central hole. Such states are no longer caused by the symmetry of the sample but rather by pinning itself, which prevents the vortex-antivortex annihilation. As a result, even micron size, clearly spaced V-Av molecules can be stabilized in large mesoscopic samples.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/c5d901/6ac980c4.pdf
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