Universal transport in two-dimensional granular superconductors

A. Frydman; O. Naaman; R. C. Dynes

doi:10.1103/PhysRevB.66.052509

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Universal transport in two-dimensional granular superconductors

A. Frydman, O. Naaman, R. C. Dynes

DOI 10.1103/PhysRevB.66.052509 · Physical Review B

T1

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Abstract

The transport properties of quench condensed granular superconductors (Pb, Sn, and Pb-Ag films) are presented and analyzed. These systems exhibit transitions from insulating to superconducting behavior as a function of intergrain 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 universally dependent on the normal state film resistance for all measured granular systems. It does not depend on the material, critical temperature, geometry, or experimental setup. We discuss possible physical scenarios to explain these findings.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.2	Pressure not reported	onset
Sn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.5	Pressure not reported	onset