Superconductivity at the Two-Dimensional Limit

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Science  05 Jun 2009:
Vol. 324, Issue 5932, pp. 1314-1317
DOI: 10.1126/science.1170775

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Superconductivity in the extreme two-dimensional limit is studied on ultrathin lead films down to two atomic layers, where only a single channel of quantum well states exists. Scanning tunneling spectroscopy reveals that local superconducting order remains robust until two atomic layers, where the transition temperature abruptly plunges to a lower value, depending sensitively on the exact atomic structure of the film. Our result shows that Cooper pairs can still form in the last two-dimensional channel of electron states, although their binding is strongly affected by the substrate.

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