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Related Experiment Videos

Nesting symmetries and diffusion in disordered d-wave superconductors.

A G Yashenkin1, W A Atkinson, I V Gornyi

  • 1Department of Physics, University of Florida, P.O. Box 118440, Gainesville, Florida 32611, USA.

Physical Review Letters
|June 21, 2001
PubMed
Summary

The low-energy density of states in disordered 2D d-wave superconductors is sensitive to disorder and band structure due to a novel diffusive mode. This mode can cause the density of states to vanish at the Fermi level in generic cases.

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Area of Science:

  • Condensed Matter Physics
  • Superconductivity Theory

Background:

  • Disordered 2D d-wave superconductors exhibit low-energy density of states (DOS) highly sensitive to physical parameters.
  • Understanding this sensitivity is crucial for comprehending superconductivity in these materials.

Purpose of the Study:

  • Investigate the origin of the sensitivity in the low-energy DOS of disordered 2D d-wave superconductors.
  • Identify the physical mechanisms governing the DOS behavior near the Fermi level.

Main Methods:

  • Employed diagrammatic techniques to analyze the electronic properties.
  • Utilized numerical solutions of the Bogoliubov-de Gennes equations for detailed simulations.

Main Results:

  • Identified a novel diffusive mode near momentum (π,π) as the source of DOS sensitivity.

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  • This mode is gapless exclusively in systems possessing global nesting symmetry.
  • The DOS vanishes at the Fermi level in generic disordered systems.

    • Conclusions:

    • The study reveals a new diffusive mode dictating the DOS behavior in 2D d-wave superconductors.
    • Observable nonmonotonic DOS behavior may occur in cuprates due to proximity to symmetric cases.