Phys. Rev. B 74, 014502 (2006) [6 pages]Insulating state of granular superconductors in a strong-coupling regimeReceived 6 June 2006; published 5 July 2006 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. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.74.014502
DOI:
10.1103/PhysRevB.74.014502
PACS:
74.81.−g, 74.20.−z, 74.45.+c, 74.78.−w
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