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Multilayers of ultrathin superconducting a-Mo₇₉Ge₂₁ and normal Ge-rich a-Mo₁-ₗGeₗ were prepared to study the effects of disorder on superconductivity in reduced dimensions. The superconducting transition temperatures of the multilayers as a function of composition and thickness of the normal metal show a systematic enhancement over the single film T₂. This effect can be attributed to a crossover from 2D single-film behavior to 3D bulk behavior as electron diffusion between individual superconducting layers increases. The nature of this crossover sheds light on the microscopic mechanisms reducing T₂.
Missert et al. (Mon,) studied this question.
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