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We study the influence of non-magnetic impurity scatterings on the tunnelingconductance of a junction consisting of a normal metal and a disorderedunconventional superconductor by solving the quasiclassical Eilenbergerequation self-consistently. We find that the impurity scatterings in both theBorn and unitary limits affect the formation of the Andreev bound states andmodify strongly the tunneling spectra around zero bias. Our results areinterpreted well by the appearance of odd-frequency Cooper pairs near theinterface and by the divergent behavior of the impurity self-energy. Thepresent paper provides a useful tool to identify the pairing symmetry ofunconventional superconductors in experiments.

Influence of the impurity scattering on charge transport in unconventional superconductor junctions