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Quantum states and vortex patterns in nanosuperconductors

Authors

  • Bart Deloof,

    1. INPAC - Institute of Nanoscale Physics and Chemistry and Theory of Nanomaterials Group, Departement of Chemistry, Belgium
    2. INPAC - Institute of Nanoscale Physics and Chemistry and Nanoscale Superconductivity and Magnetism Group, Departement of Physics and Astronomy, Belgium
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  • Victor V. Moshchalkov,

    1. INPAC - Institute of Nanoscale Physics and Chemistry and Nanoscale Superconductivity and Magnetism Group, Departement of Physics and Astronomy, Belgium
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  • Liviu F. Chibotaru

    Corresponding author
    1. INPAC - Institute of Nanoscale Physics and Chemistry and Theory of Nanomaterials Group, Departement of Chemistry, Belgium
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Abstract

The quanum levels and corresponding vortex states in nanoscale superconductors are investigated within generalized Bogolubov-de Gennes theory. For symmetric (square-shaped) samples thermodynamically stable vortex phases form symmetry-consistent patterns and no transition to conventional Abrikosov-like vortex patterns occurs till T=0K for sizes not exceeding 25 nm. For vorticity inline image a giant vortex is stabilized at temperatures in the vicinity of inline image, which transforms into a giant antivortex inline image and four normal vortices with lowering the temperature. On the other hand, the vortex pattern for vorticity inline image corresponds to an antivortex inline image and four normal vortices in the whole temperature domain.

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