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Shape of nanosize superconducting grains: does it influence pairing characteristics?

Gladilin, V.N ; Fomin, V.M ; Devreese, J.T

Solid state communications, 2002-03, Vol.121 (9), p.519-523 [Periódico revisado por pares]

Oxford: Elsevier Ltd

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  • Título:
    Shape of nanosize superconducting grains: does it influence pairing characteristics?
  • Autor: Gladilin, V.N ; Fomin, V.M ; Devreese, J.T
  • Assuntos: A. Superconducting grains ; Bcs theory and its development ; Condensed matter: electronic structure, electrical, magnetic, and optical properties ; D. Electron–electron interactions ; Exact sciences and technology ; Physics ; Superconductivity ; Theory and models of superconducting state
  • É parte de: Solid state communications, 2002-03, Vol.121 (9), p.519-523
  • Notas: ObjectType-Article-2
    SourceType-Scholarly Journals-1
    ObjectType-Feature-1
    content type line 23
  • Descrição: The Richardson exact solution for the reduced BCS Hamiltonian is applied to examine how sensitive are the pairing characteristics (condensation energy, spectroscopic gap, parity gap) to a specific configuration of single-electron energy levels in nanosize metallic grains. Using single-electron energy spectra in parallelepiped-shaped potential boxes with various volumes and aspect ratios as a model of energy levels in grains, we show that this sensitivity is extremely high. Due to such an extreme sensitivity, the detailed shape of grains cannot be detected through the pairing characteristics, averaged over an ensemble of grains, even in the case of relatively small size dispersion within this ensemble. We analyse the effect of the pairing interaction on the excited-level spacings in superconducting grains and comment on the influence of shape-dependent fluctuations in single-electron energy spectra on the possibility to reveal this effect through tunnelling measurements.
  • Editor: Oxford: Elsevier Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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