14
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Fluctuations in a mesoscopic superconducting ring: resonant behavior of conductivity and specific heat in two mode critical regime

      Preprint
      ,

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          The critical fluctuations in a mesoscopic superconducting ring are studied within the Ginzburg-Landau approach. The nonlocal conductivity as well as the specific heat are calculated as functions of the magnetic flux \(\Phi\) through the ring. At \(\Phi=\Phi_0/2\) two low-energy eigenstates become degenerate and near this point the behavior of fluctuations-dependent quantities change dramatically: both the zero Fourier component \(\sigma_0\) of the fluctuation conductivity and the specific heat become non-monotonic functions of \(|\Phi-\Phi_0/2|\) with rather special resonant structure.

          Related collections

          Most cited references11

          • Record: found
          • Abstract: not found
          • Article: not found

          Intrinsic Resistive Transition in Narrow Superconducting Channels

            Bookmark
            • Record: found
            • Abstract: not found
            • Article: not found

            Observation of Quantum Periodicity in the Transition Temperature of a Superconducting Cylinder

              Bookmark
              • Record: found
              • Abstract: found
              • Article: found
              Is Open Access

              Fluctuation Superconductivity in Mesoscopic Aluminum Rings

              Fluctuations are important near phase transitions, where they can be difficult to describe quantitatively. Superconductivity in mesoscopic rings is particularly intriguing because the critical temperature is an oscillatory function of magnetic field. There is an exact theory for thermal fluctuations in one-dimensional superconducting rings, which are therefore expected to be an excellent model system. We measure the susceptibility of many rings, one ring at a time, using a scanning SQUID that can isolate magnetic signals from seven orders of magnitude larger background applied flux. We find that the fluctuation theory describes the results and that a single parameter characterizes the ways in which the fluctuations are especially important at magnetic fields where the critical temperature is suppressed.
                Bookmark

                Author and article information

                Journal
                06 April 2011
                2011-08-21
                Article
                10.1103/PhysRevB.84.064527
                1104.1076
                7101a6d5-cded-4246-aad7-eda10ff48b76

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

                History
                Custom metadata
                8 pages, 2 figures
                cond-mat.mes-hall

                Comments

                Comment on this article