Czechoslovak Journal of Physics

, Volume 46, Supplement 2, pp 607–608 | Cite as

Superconductor-insulator transition with non-universal conductivity

  • Karl-Heinz Wagenblast
  • Rosario Fazio
  • Gerd Schön
  • Gergley Zimanyi
LTSC—Theory

Abstract

Motivated by experimental evidence for the importance of fermionic degrees of freedom near the superconductor-insulator transition, we take into account gapless electronic excitations for the description of the transition. Integrating them out yields a damping for the phase of the superconducting grains. We derive a Ginzburg-Landau-Wilson description for the onset of superfluidity which shows a non-ohmic dynamics. This dynamics depends qualitatively on the strength of the damping. Sufficiently strong damping modifies both, the critical behavior and the response near the transition. The critical exponents depend on the damping strength. The conductivity at the transition is finite but non-universal.

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Copyright information

© Institute of Physics, Acad. Sci. CR 1996

Authors and Affiliations

  • Karl-Heinz Wagenblast
    • 1
  • Rosario Fazio
    • 2
  • Gerd Schön
    • 1
  • Gergley Zimanyi
    • 3
  1. 1.Institut für Theoretische FestkörperphysikUniversität KarlsruheKarlsruheGermany
  2. 2.Istituto di FisicaUniversità di CataniaCataniaItaly
  3. 3.Department of PhysicsUniversity of CaliforniaDavisUSA

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