Second generation of vortex-antivortex states in mesoscopic superconductors: stabilization by artificial pinning - Condensed Matter > SuperconductivityReport as inadecuate




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Abstract: Antagonistic symmetries of superconducting polygons and their inducedmulti-vortex states in a homogeneous magnetic field may lead to appearance ofantivortices in the vicinity of the superconducting-normal state boundarywhere mesoscopic confinement is particularly strong. Resultingvortex-antivortex V-Av molecules match the sample symmetry, but are extremelysensitive to defects and fluctuations and remain undetected experimentally.Here we show that V-Av states can re-appear deep in the superconducting statedue to an array of perforations in a polygonal setting, surrounding a centralhole. Such states are no longer caused by the symmetry of the sample but ratherby pinning itself, which prevents the vortex-antivortex annihilation. As aresult, even micron-size, clearly spaced V-Av molecules can be stabilized inlarge mesoscopic samples.



Author: R. Geurts, M.V. Milosevic, F.M. Peeters

Source: https://arxiv.org/







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