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The properties of a very weakly coupled two-dimensional array of 20 000 1-m^2Nb Josephson junctions have been studied to 3 mK. Not only are many of the characteristics similar to those of granular films, but new effects, particularly resistance periodicities with magnetic field, provide direct evidence for the increase of two-dimensional phase coherence as the temperature is lowered through the resistive transition.
Voss et al. (Mon,) studied this question.
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