Universal transport in 2D granular superconductors

Details Universal transport in 2D granular superconductors Universal transport in 2D granular superconductors

2002-02-20

arxiv.org/abs/cond-mat/0202342v1

Phys. Rev. B66 052509 (2002)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.66.052509

The transport properties of quench condensed granular superconductors are presented and analyzed. These systems exhibit transitions from insulating to superconducting behavior as a function of inter-grain spacing. Superconductivity is characterized by broad transitions in which the resistance drops exponentially with reducing temperature. The slope of the log R versus T curves turns out to be universaly dependent on the normal state film resistance for all measured granular systems. It does not depend on the material, critical temperature, geometry, or experimental set-up. We discuss possible physical scenarios to explain these findings.

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