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Related Experiment Videos

Critical fluctuations in a mesoscopic superconducting ring.

A I Buzdin1, A A Varlamov

  • 1Condensed Matter Theory Group, University Bordeaux I, CPMOH UMR-CNRS 5798, F-33405 Talence Cedex, France.

Physical Review Letters
|August 23, 2002
PubMed
Summary

Nonlocal magnetoconductivity fluctuations in superconducting rings near the critical temperature are analyzed. The study reveals a logarithmic singularity in the homogeneous component of paraconductivity, while other components remain non-singular.

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Area of Science:

  • Condensed Matter Physics
  • Superconductivity

Background:

  • Superconducting rings exhibit unique quantum phenomena.
  • Understanding magnetoconductivity fluctuations is crucial for characterizing superconductivity.

Purpose of the Study:

  • To investigate nonlocal magnetoconductivity fluctuations in superconducting submicron rings.
  • To analyze the behavior of paraconductivity Fourier components near the critical temperature.

Main Methods:

  • Solving the time-dependent Ginzburg-Landau equation.
  • Order parameter mode separation.
  • Calculating paraconductivity Fourier components.

Main Results:

  • The homogeneous component of paraconductivity exhibits a logarithmic singularity at the critical temperature (Tc).

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  • Other paraconductivity components were found to be non-singular.
  • Analysis focused on the critical fluctuation region.

    • Conclusions:

    • The study provides insights into the nature of fluctuations in superconducting rings.
    • The findings contribute to the understanding of critical phenomena in superconductors.