Insulating state of granular superconductors in a strong-coupling regime

Details Insulating state of granular superconductors in a strong-coupling regime Insulating state of granular superconductors in a strong-coupling regime

2005-09-14

arxiv.org/abs/cond-mat/0509386v3

Phys. Rev. B 74, 014502 (2006)

Physics

Condensed Matter

Disordered Systems and Neural Networks

6 pages, 3 figures. Version 3: extended, added discussion of experiment. Final version as published in PRB

Scientific paper

10.1103/PhysRevB.74.014502

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 the dispersion in grain sizes and explains the mechanism leading to a giant peak in the magnetoresistance.

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