Inhomogeneous order-parameter suppression in disordered d-wave superconductors

Abstract

We report on a numerical study of disorder effects in 2D d-wave BCS superconductors. We compare exact numerical solutions of the Bogoliubov-deGennes (BdG) equations for the density of states $\rho (E)$ with the standard T-matrix approximation. Local suppression of the order parameter near impurity sites, which occurs in self-consistent solutions of the BdG equations, leads to apparent power law behavior $\rho (E)\sim |E{|}^{\alpha }$ with non-universal $\alpha$ over an energy scale comparable to the single impurity resonance energy ${\Omega }_0$. We show that the novel effects arise from static spatial correlations between the order parameter and the impurity distribution.

5 pages, 3 figures, updated figures and discussion

References in corpus (1)

• Resonant states and order-parameter suppression near point-like impurities in d-wave superconductors

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