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

Taejoon Kouh; J. M. Valles, Jr.

doi:10.1103/PhysRevB.67.140506

← Back to search

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

Taejoon Kouh, J. M. Valles, Jr.

DOI 10.1103/PhysRevB.67.140506 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We have fabricated quasi-two-dimensional disordered arrays of nanoscale Pb grains coupled by an overlayer of Ag grains. Their temperature-dependent resistive transitions follow predictions for an array of mesoscopic superconductor–normal-metal–superconductor junctions. The decrease of their transition temperatures with Ag overlayer thickness systematically deviates from the Cooper limit theory of the proximity effect as the Pb grain size decreases. The deviations occur when the estimated number of Cooper pairs per grain is <1 and suggest the approach to a superconductor-to-metal transition.

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.	1.3	Pressure not reported	onset