Abstract
The consequences of a vortex unbinding picture of two-dimensional superconductivity are worked out. Although there is no true finite-temperature phase transition, dirty superconducting films should display anomalous behavior below the BCS transition temperature and above an effective Kosterlitz-Thouless vortex unbinding temperature. In particular, both the conductivity and fluctuation diamagnetism behave like ξ 2+ in this regime, where ξ+ is the correlation length calculated by Kosterlitz, ξ+-ξ c exp (B/T − T c)1/2. We estimate ξc, B, and the vortex unbinding temperature, and determine the nonlinear resistivity below T c. A recent theory of vortex dynamics, together with a time-dependent Ginzburg-Landau theory, lead to a determination of the frequency-dependent conductivity.
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This work was supported by the National Science Foundation under Grant No. DMR 77-10210.
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Halperin, B.I., Nelson, D.R. Resistive transition in superconducting films. J Low Temp Phys 36, 599–616 (1979). https://doi.org/10.1007/BF00116988
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DOI: https://doi.org/10.1007/BF00116988