Abstract

Experimental measurements have been made on Au-Al tunnel junctions in which the gold electrode was semicontinuous. The gold film was analysed by TEM and harmonic analysis was used to obtain the small signal conductance and its derivative at low temperatures. Periodic variations and linear characteristics were found in the conductance versus junction bias potential curves. These results are compared with similar results obtained from gold-island films. The overall effects are discussed both in terms of a Coulomb charging model and localization in a film consisting of a random network of grains.

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