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Title
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Parity-fluctuation induced enlargement of the ratio in metallic grains
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Author
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Abstract
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| 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. |
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Language
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English
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Source (journal)
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Physical review : B : condensed matter and materials physics. - Lancaster, Pa, 1998 - 2015
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Publication
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Lancaster, Pa
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2011
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ISSN
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1098-0121
[print]
1550-235X
[online]
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DOI
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10.1103/PHYSREVB.84.214518
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Volume/pages
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84
:21
(2011)
, p. 214518,1-214518,12
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Article Reference
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214518
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ISI
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000298114100003
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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