Two-band superconducting square with a central defect: role of the deGennes extrapolation length

Thiago Nunes Jorge (), Cristhian Aguirre, Alberto de Arruda and José Barba-Ortega
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Thiago Nunes Jorge: Departamento de Física, Universidade Federal de Mato-Grosso
Cristhian Aguirre: Departamento de Física, Universidade Federal de Mato-Grosso
Alberto de Arruda: Departamento de Física, Universidade Federal de Mato-Grosso
José Barba-Ortega: Departamento de Física, Universidad Nacional de Colombia

The European Physical Journal B: Condensed Matter and Complex Systems, 2020, vol. 93, issue 4, 1-7

Abstract: Abstract We present the influence of the deGennes extrapolation length on the vortex matter in a two band superconducting square with a central defect. This is determined by considering different values of the de Gennes extrapolation length b on the lateral surface of the sample. Our investigation was carried out by solving the two-dimensional time-dependent Ginzburg-Landau equations for a two-band system (2B-TDGL). We studied the density, magnetization, vorticity, and critical fields of the superconducting electrons as functions of the external applied magnetic field for different values of b on the surfaces of the sample and different sizes of the internal square defect. We show an unconventional vortex state due to the repulsive (attractive) short- (long-) range potential between the vortices. Finally, we show that at the limit of the thin film, a two-band system behaves like a three-band system. Graphical abstract

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1140/epjb/e2020-100418-4

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