CROITORU, Mihail D.; SHANENKO, A. A.; PEETERS, F. M.; AXT, V. M.

doi:10.1103/PhysRevB.84.214518

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CROITORU, Mihail D.
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

SHANENKO, A. A.
Departement Fysica

PEETERS, F. M.
Departement Fysica

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Physical Review B: Condensed Matter and Materials Physics (1998-2015). 2011-12-15, vol. 84, n° 21, p. 214518 (1-12)

American Physical Society

Resumen en inglés

We investigate how the interplay of quantum confinement and particle number-parity fluctuations affects superconducting correlations in ultra-small metallic grains. Using the number-parity projected BCS formalism we calculate the critical temperature and the excitation gap as a function of the grain size for grains with even and odd number of confined carriers. We show that the experimentally observed anomalous increase of the coupling ratio ΔE/kBTc with decreasing superconducting grain size can be attributed to an enhancement of the number-parity fluctuations in ultra-small grains.< Leer menos

DOI

http://dx.doi.org/10.1103/PhysRevB.84.214518

Proyecto europeo

Superconductivity in quantum-size regime

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