Tunneling into granular Pb films in the superconducting and insulating regimes

R. P. Barber, Jr.; L. M. Merchant; A. La Porta; R. C. Dynes

doi:10.1103/PhysRevB.49.3409

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Tunneling into granular Pb films in the superconducting and insulating regimes

R. P. Barber, Jr., L. M. Merchant, A. La Porta, R. C. Dynes

DOI 10.1103/PhysRevB.49.3409 · Physical Review B

T1

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Abstract

Tunneling measurements have been performed on both sides of the insulator-superconductor transition in quench-condensed granular Pb films. The results indicate that the Pb film consists of fully superconducting grains with essentially bulk values for the superconducting energy gap Δ and transition temperature Tc, even when the film exhibits insulating behavior in transport measurements. The density of states inferred from measurements in perpendicular magnetic field are consistent with magnetic spin-flip broadening.

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.	7.1	Pressure not reported	unknown
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.1	Pressure not reported	unknown