Giant vortex states in type I superconductors simulated by Ginzburg-Landau equations



: Palonen H, Jaykka J, Paturi P

Publisher: IOP PUBLISHING LTD

: 2013

: Journal of Physics: Condensed Matter

: JOURNAL OF PHYSICS-CONDENSED MATTER

: J PHYS-CONDENS MAT

: 38

: 25

: 38

: 7

: 0953-8984

DOI: https://doi.org/10.1088/0953-8984/25/38/385702


The quantization of magnetic flux in superconductors is usually seen as vortices penetrating the sample. While vortices are unstable in bulk type I superconductors, restricting the superconductor causes a variety of vortex structures to appear. We present a systematic study of giant vortex states in type I superconductors obtained by numerically solving the Ginzburg-Landau equations. The size of the vortices is seen to increase with decreasing film thickness. In type I superconductors, giant vortices appear at intermediate thicknesses but they do not form a well-defined vortex lattice. In the thinnest type I films, singly quantized vortices seem to be stabilized by the geometry of the sample instead of an increase in the effective Ginzburg-Landau parameter.



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