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Parity-fluctuation induced enlargement of the ratio ΔE/kBTc in metallic grains

Title data

Croitoru, Mikhail D. ; Shanenko, A. A. ; Peeters, F. M. ; Axt, Vollrath M.:
Parity-fluctuation induced enlargement of the ratio ΔE/kBTc in metallic grains.
In: Physical Review B. Vol. 84 (2011) Issue 21 . - Art.Nr. 214518, 12 S..
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.84.214518

Project information

Project financing: Supported by the European Community under a Marie Curie IEF Action (Grant Agreement No. PIEF-GA-2009-235486-ScQSR), the Flamish Science Foundation (FWO-Vl), and the Belgian Science Policy (IAP).

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: superconductivity; confined systems; metallic grains; BCS; parity fluctuations
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III > Chair Theoretical Physics III - Univ.-Prof. Dr. Martin Axt
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 30 Oct 2017 13:56
Last Modified: 30 Oct 2017 13:56
URI: https://eref.uni-bayreuth.de/id/eprint/40225