Abstract
Granular metal films, consisting of fine mixtures of immiscible metals and insulators, are found to exhibit a minimum metallic conductivity, σm, which varies inversely as the average metal grain size d. It is shown that, as a consequence of localization on metal grains due to the electrostatic charging energy associated with the grain, σm?e2/2zh/d (z is the number of nearest neighbor grains), in order of magnitude agreement with observations.
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