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

Author

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  • Thiago Nunes Jorge

    (Departamento de Física, Universidade Federal de Mato-Grosso
    CMULTI, Universidade Federal do Acre-AC)

  • 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
    Foundation of Researchers in Science and Technology of Materials – FORISTOM)

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

Suggested Citation

  • Thiago Nunes Jorge & Cristhian Aguirre & Alberto de Arruda & José Barba-Ortega, 2020. "Two-band superconducting square with a central defect: role of the deGennes extrapolation length," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 93(4), pages 1-7, April.
    • Handle: RePEc:spr:eurphb:v:93:y:2020:i:4:d:10.1140_epjb_e2020-100418-4
    DOI: 10.1140/epjb/e2020-100418-4
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    Solid State and Materials;

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