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Superconductivity in a mesoscopic double square loop: Effect of imperfections

Fomin, V. M. ; Devreese, J. T. ; Bruyndoncx, V. ; Moshchalkov, V. V.

Physical Review B, 10/2000, Vol.62(13), pp.9186-9190 [Periódico revisado por pares]

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  • Título:
    Superconductivity in a mesoscopic double square loop: Effect of imperfections
  • Autor: Fomin, V. M. ; Devreese, J. T. ; Bruyndoncx, V. ; Moshchalkov, V. V.
  • Assuntos: Condensed Matter - Superconductivity
  • É parte de: Physical Review B, 10/2000, Vol.62(13), pp.9186-9190
  • Descrição: We have generalized the network approach to include the effects of short-range imperfections in order to analyze recent experiments on mesoscopic superconducting double loops. The presence of weakly scattering imperfections causes gaps in the phase boundary $B(T)$ or $\Phi(T)$ for certain intervals of $T$, which depend on the magnetic flux penetrating each loop. This is accompanied by a critical temperature $T_c(\Phi)$, showing a smooth transition between symmetric and antisymmetric states. When the scattering strength of imperfections increases beyond a certain limit, gaps in the phase boundary $T_c(B)$ or $T_c(\Phi)$ appear for values of magnetic flux lying in intervals around half-integer $\Phi_0=hc/2e$. The critical temperature corresponding to these values of magnetic flux is determined mainly by imperfections in the central branch. The calculated phase boundary is in good agreement with experiment. Comment: 9 pages, 6 figures
  • Idioma: Inglês

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