Quasiparticle Conductivities in Disordered d-Wave Superconductors
Michele Fabrizio, Luca Dell'Anna, Claudio Castellani
DOI 10.1103/PhysRevLett.88.076603 · Physical Review Letters
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Abstract
We study the quasiparticle transport coefficients in disordered d-wave superconductors. We find that spin and charge excitations are generally localized unless magnetic impurities are present. If the system is close to a nesting point in the impurity-scattering unitary limit, the tendency towards localization is reduced while the quasiparticle density of states gets enhanced by disorder. We also show that the residual repulsive interaction among quasiparticles has a delocalizing effect and increases the density of states.
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