Ultra-small metallic grains: effect of statistical fluctuations of the chemical potential on superconducting correlations and vice versa
CROITORU, Mihail D.
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Research Center for Applied Sciences
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Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Research Center for Applied Sciences
CROITORU, Mihail D.
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Research Center for Applied Sciences
< Reduce
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Research Center for Applied Sciences
Language
en
Article de revue
This item was published in
Journal of Physics: Condensed Matter. 2012, vol. 24, n° 27, p. 245701
IOP Publishing
English Abstract
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 ...Read more >
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.Read less <
European Project
Superconductivity in quantum-size regime
Origin
Hal imported