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We have fabricated quasi-two-dimensional arrays of nano-scale Pb grainscoupled by an overlayer of Ag grains. Their temperature dependent resistivetransitions follow predictions for an array of mesoscopicsuperconductor-normal-superconductor junctions. The decrease of theirtransition temperatures with Ag overlayer thickness systematically deviatesfrom the Cooper limit theory of the proximity effect as the Pb grain sizedecreases. The deviations occur when the estimated number of Cooper pairs pergrain is less than or equal to 1 and suggest the approach to a superconductorto metal transition.Comment: 11 pages, Pdf only, Revisions include text and figure

Deviations from mean-field behavior in disordered nanoscale superconductor–normal-metal–superconductor arrays