Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-09-02
Phys. Rev. B 71, 184501 (2005)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
12 pages, 9 figures, several sections clarifying the details of our calculations are added
Scientific paper
10.1103/PhysRevB.71.184501
We 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.
Beloborodov Igor S.
Efetov Konstantin B.
Lopatin Andrei V.
Vinokur Valeri M.
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