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The destruction of superconductivity in granular and highly disordered metals is discussed in the light of the modern picture of the metal-insulator transition induced by Anderson localization. For small grains superconductivity is lost when localization sets in. Systems composed of large grains may phase lock at a temperature, T₂, much smaller than the T₂^0 of the clean metal. T₂ is estimated as a function of the appropriate parameters and the results are shown to be consistent with existing experiments.
Imry et al. (Tue,) studied this question.