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Related Experiment Videos

Superconductivity in disordered thin films: giant mesoscopic fluctuations.

M A Skvortsov1, M V Feigel'man

  • 1L. D. Landau Institute for Theoretical Physics, Moscow 119334, Russia. skvor@itp.ac.ru

Physical Review Letters
|August 11, 2005
PubMed
Summary

Mesoscopic fluctuations in disordered thin films are enhanced near critical conductance. This leads to spatial variations in superconductivity and a percolative transition, impacting material properties.

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Area of Science:

  • Condensed matter physics
  • Materials science

Background:

  • Superconductive properties in uniformly disordered thin films are typically uniform.
  • Mesoscopic fluctuations are usually small, proportional to 1/g, where g is dimensionless conductance.

Purpose of the Study:

  • To investigate the behavior of mesoscopic fluctuations in disordered thin films.
  • To understand the impact of these fluctuations near critical conductance.

Main Methods:

  • Theoretical analysis of superconductive properties in disordered thin films.
  • Examination of mesoscopic fluctuations and their enhancement near critical conductance.

Main Results:

  • Mesoscopic fluctuations are significantly enhanced near the critical conductance (g_cF >> 1).

Related Experiment Videos

  • Superconductivity is destroyed at T=0 due to Coulomb suppression of Cooper attraction.
  • Strong spatial fluctuations in local transition temperature arise.
  • The thermal superconductive transition exhibits a percolative nature.

    • Conclusions:

    • Intrinsic inhomogeneities in superconductive properties are crucial in disordered thin films.
    • Enhanced mesoscopic fluctuations near critical conductance drive a percolative transition.
    • Understanding these phenomena is key for designing superconducting materials.