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Quasiparticle conductivities in disordered d-wave superconductors.

Michele Fabrizio1, Luca Dell'Anna, Claudio Castellani

  • 1Istituto Nazionale di Fisica della Materia and International School for Advanced Studies (SISSA), Via Beirut 2-4, I-34014 Trieste, Italy.

Physical Review Letters
|February 28, 2002
PubMed
Summary

In disordered d-wave superconductors, spin and charge excitations typically localize. However, magnetic impurities or repulsive interactions can delocalize these excitations and enhance the density of states.

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Area of Science:

  • Condensed matter physics
  • Superconductivity theory

Background:

  • Disordered d-wave superconductors exhibit complex electronic properties.
  • Understanding quasiparticle behavior is crucial for characterizing these materials.

Purpose of the Study:

  • To investigate quasiparticle transport coefficients in disordered d-wave superconductors.
  • To determine the conditions under which quasiparticle localization or delocalization occurs.

Main Methods:

  • Theoretical analysis of quasiparticle transport.
  • Examination of the effects of magnetic impurities and residual interactions.

Main Results:

  • Spin and charge excitations are generally localized in disordered d-wave superconductors.
  • Magnetic impurities reduce localization near nesting points, enhancing the density of states.

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  • Residual repulsive interactions between quasiparticles have a delocalizing effect and increase the density of states.

    • Conclusions:

    • Disorder in d-wave superconductors leads to localization of excitations, but this can be mitigated.
    • The presence of magnetic impurities and repulsive interactions are key factors in controlling quasiparticle behavior and density of states.