Insulating state of granular superconductors in a strong-coupling regime
Abstract
We analyze the possibility of the formation of a magnetic-field-induced insulating state in a two-dimensional granular superconductor with relatively strong intergranular coupling and show that such a state appears in a model with spatial variations of the single-grain critical magnetic field. This model describes realistic granular samples with a dispersion in grain sizes and explains the mechanism leading to a giant peak in the magnetoresistance.
- Publication:
-
Physical Review B
- Pub Date:
- July 2006
- DOI:
- 10.1103/PhysRevB.74.014502
- arXiv:
- arXiv:cond-mat/0509386
- Bibcode:
- 2006PhRvB..74a4502B
- Keywords:
-
- 74.81.-g;
- 74.20.-z;
- 74.45.+c;
- 74.78.-w;
- Inhomogeneous superconductors and superconducting systems;
- Theories and models of superconducting state;
- Proximity effects;
- Andreev effect;
- SN and SNS junctions;
- Superconducting films and low-dimensional structures;
- Condensed Matter - Disordered Systems and Neural Networks;
- Condensed Matter - Superconductivity
- E-Print:
- 6 pages, 3 figures. Version 3: extended, added discussion of experiment. Final version as published in PRB