Influence of impurity-scattering on tunneling conductance in d-wave superconductors with broken time reversal symmetry

Abstract

Effects of impurity scattering on tunneling conductance in dirty normal-metal/insulator/superconductor junctions are studied based on the Kubo formula and the recursive Green function method. The zero-bias conductance peak (ZBCP) is a consequence of the unconventional pairing symmetry in superconductors. The impurity scattering in normal metals suppresses the amplitude of the ZBCP. The degree of the suppression agrees well with results of the quasiclassical Green function theory. When superconductors have $d$+is-wave pairing symmetry, the time-reversal symmetry is broken in superconductors and the ZBCP splits into two peaks. The random impurity scattering reduces the height of the two splitting peaks. The position of the splitting peaks, however, almost remains unchanged even in the presence of the strong impurity scattering. Thus the two splitting peaks never merge into a single ZBCP.

arXiv comment12 pages, 5 figures, using jpsj2.cls and overcite.sty

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Cited by in corpus (5)

• A phenomenological theory of zero-energy Andreev resonant states
• Tunneling Spectra of Skutterudite PrOs_4Sb_{12}
• Zero-bias conductance peak splitting due to multiband effect in tunneling spectroscopy
• Josephson effect in d-wave superconductor junctions in a lattice model
• Smearing origin of zero-bias conductance peak in Ag-SiO-Bi-2212 planar tunnel junctions: influence of diffusive normal metal verified with the circuit theory