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We have studied the transition from strong to weak localization in in situ grown granular metal wires of Sn, Pb, Pb0.85Bi0.15, Ag, and Au with widths as small as 400 {}. In our wires we observe a transition dramatically different from that seen in 2D films. The wires exhibit an abrupt drop in resistance as large as 4 orders of magnitude. Within this resistance ``gap'' no stable wire is observed. We speculate that we are observing a first order electronic phase transition between the strongly localized and weakly localized states.
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Herzog et al. (1996) studied this question.
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