Fluctuation spectroscopy of granularity in superconducting structures

We suggest to use "fluctuation spectroscopy" as a method to detect granularity in a disordered metal close to a superconducting transition. We show that with lowering temperature T the resistance R(T) of a system of relatively large grains initially grows due to the fluctuation suppression...

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Bibliographic Details
Published in:Physical review letters 2008-03, Vol.100 (11), p.117003-117003, Article 117003
Main Authors: Lerner, I V, Varlamov, A A, Vinokur, V M
Format: Article
Language:English
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Summary:We suggest to use "fluctuation spectroscopy" as a method to detect granularity in a disordered metal close to a superconducting transition. We show that with lowering temperature T the resistance R(T) of a system of relatively large grains initially grows due to the fluctuation suppression of the one-electron tunneling but decreases with further lowering T due to the coherent charge transfer of the fluctuation Cooper pairs. Under certain conditions, such a maximum in R(T) turns out to be sensitive to weak magnetic fields due to a novel Maki-Thompson-type mechanism.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.100.117003