1. Steven M. Girvin is in the Department of Physics, Yale University, New Haven, Connecticut, 06520-8120 USA. e-mail: steven.girvin@yale.edu

Abstract

Whether or not a superconductor is truly superconducting depends on its size and even its shape. In a geometry intermediate between one and two dimensions, it seems a thin film does not reach a state of zero resistance except at zero temperature.

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