CROITORU, Mihail D.; SHANENKO, A. A.; KAUN C., C.; PEETERS, F. M.

doi:10.1088/0953-8984/24/27/275701

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CROITORU, Mihail D.
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Research Center for Applied Sciences

SHANENKO, A. A.
Departement Fysica

KAUN C., C.
Research Center for Applied Sciences

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Ce document a été publié dans

Journal of Physics: Condensed Matter. 2012, vol. 24, n° 27, p. 245701

IOP Publishing

Résumé en anglais

Superconducting correlations in an isolated metallic grain are governed by the interplay between two energy scales: the mean level spacing and the bulk pairing gap 10, which are strongly influenced by the position of the chemical potential with respect to the closest single-electron level. In turn superconducting correlations affect the position of the chemical potential. Within the parity projected BCS model we investigate the probability distribution of the chemical potential in a superconducting grain with randomly distributed single-electron levels. Taking into account statistical fluctuations of the chemical potential due to the pairing interaction, we find that such fluctuations have a significant impact on the critical level spacing c at which the superconducting correlations cease: the critical ratio c=10 at which superconductivity disappears is found to be increased.< Réduire

DOI

http://dx.doi.org/10.1088/0953-8984/24/27/275701

Projet Européen

Superconductivity in quantum-size regime

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Importé de hal

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Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798