Fluctuation Spectroscopy of Granularity in Superconducting Structures
Abstract
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.
- Publication:
-
Physical Review Letters
- Pub Date:
- March 2008
- DOI:
- 10.1103/PhysRevLett.100.117003
- arXiv:
- arXiv:0707.4237
- Bibcode:
- 2008PhRvL.100k7003L
- Keywords:
-
- 74.81.Bd;
- 72.15.-v;
- 73.23.-b;
- Granular melt-textured amorphous and composite superconductors;
- Electronic conduction in metals and alloys;
- Electronic transport in mesoscopic systems;
- Condensed Matter - Superconductivity;
- Condensed Matter - Mesoscopic Systems and Quantum Hall Effect
- E-Print:
- A final version, as published