Fluctuation spectroscopy of granularity in superconducting structures

Details Fluctuation spectroscopy of granularity in superconducting structures Fluctuation spectroscopy of granularity in superconducting structures

2007-07-28

arxiv.org/abs/0707.4237v2

Phys. Rev. Lett. 100,117003 (2008)

Physics

Condensed Matter

Superconductivity

A final version, as published; the introduction and summary are considerably revised

Scientific paper

10.1103/PhysRevLett.100.117003

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.

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