Effect of gap suppression on the ab-plane conductance spectrum of a normal-metal–da2–b2-wave-superconductor junction
P. Pairor, S. Nilmoung
DOI 10.1103/PhysRevB.70.184509 · Physical Review B
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Abstract
We study the effect of gap suppression near the surface on the conductance spectra of normal metal-{100} and {110} da2–b2-wave superconductor junctions using the scattering method. We find that for {100} junctions the positions of the maxima of the spectra are not always at the gap maximum of the bulk. The positions depend on the degree of the gap suppression at the interface. For {110} junctions, we find that the width of zero-bias conductance peaks (ZBCPs) in the spectra depends on the magnitude of the gap function at the interface of the junction. The ZBCP is absent when the gap function is totally suppressed at the interface. We also find that the shape of the spectra depends on the slope of the order parameter at the interface.
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