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29 March 2024
 
  » arxiv » cond-mat/0409057

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Effects of fluctuations and Coulomb interaction on the transition temperature of granular superconductors
I.S. Beloborodov ; K.B. Efetov ; A.V. Lopatin ; V.M. Vinokur ;
Date 2 Sep 2004
Journal Phys. Rev. B 71, 184501 (2005)
Subject Mesoscopic Systems and Quantum Hall Effect; Superconductivity | cond-mat.mes-hall cond-mat.supr-con
AbstractWe investigate the suppression of superconducting transition temperature in granular metallic systems due to (i) fluctuations of the order parameter (bosonic mechanism) and (ii) Coulomb repulsion (fermionic mechanism) assuming large tunneling conductance between the grains $g_{T}gg 1$. We find the correction to the superconducting transition temperature for 3$d$ granular samples and films. We demonstrate that if the critical temperature $T_c > g_T delta$, where $delta$ is the mean level spacing in a single grain the bosonic mechanism is the dominant mechanism of the superconductivity suppression, while for critical temperatures $T_c < g_T delta$ the suppression of superconductivity is due to the fermionic mechanism.
Source arXiv, cond-mat/0409057
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