Influence of impurity scattering on tunneling conductance in normal-metal–d-wave superconductor junctions

Y. Tanaka; Y. Tanuma; S. Kashiwaya

doi:10.1103/PhysRevB.64.054510

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Influence of impurity scattering on tunneling conductance in normal-metal–d-wave superconductor junctions

Y. Tanaka, Y. Tanuma, S. Kashiwaya

DOI 10.1103/PhysRevB.64.054510 · Physical Review B

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Abstract

Tunneling-conductance spectra in a normal-metal–d-wave superconductor junction under the presence of bulk impurities in the superconductor are studied. The quasiclassical theory has been applied to calculate the spatial variation of the pair potential and the effect of impurity scattering has been introduced by the t-matrix approximation. The magnitude of a subdominant s-wave component at the interface is shown to be robust against the impurity scattering while that for a subdominant dxy-wave component is largely suppressed with the increase of the impurity scattering rate. The zero-bias conductance peak due to the zero-energy Andreev bound states is significantly broadened for the case of the Born-limit impurity compared with that of unitary-limit impurity.