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

S. V. Mironov; A. Buzdin

doi:10.1103/PhysRevB.84.064527

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

S. V. Mironov, A. Buzdin

DOI 10.1103/PhysRevB.84.064527 · Physical Review B

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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 Φ through the ring. At Φ=Φ0/2 two low-energy eigenstates become degenerate and near this point the behavior of fluctuation-dependent quantities changes dramatically: both the zero Fourier component σ0 of the fluctuation conductivity and the specific heat become nonmonotonic functions of |Φ−Φ0/2| with rather special resonant structure.