Critical fluctuations in a mesoscopic superconducting ring.
The nonlocal magnetoconductivity fluctuations in a superconducting submicron ring, with radius comparable to the Ginzburg-Landau coherence length, are studied. The order parameter mode separation yields to the solution of the time-dependent Ginzburg-Landau equation and the paraconductivity Fourier components are calculated in the vicinity of the critical temperature, including the critical fluctuation region. The homogeneous component has a logarithmic singularity at T(c) while the other components are found to be not singular.
Condensed Matter Theory Group, University Bordeaux I, CPMOH UMR-CNRS 5798, F-33405 Talence Cedex, France.
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Buzdin
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Varlamov