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 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.
School of Physics and Astronomy, University of Birmingham, Edgbaston, B15 2TT Birmingham, United Kingdom.
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Lerner
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Varlamov
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Vinokur