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Differential conductance of normal metal-insulator- d-wave superconductor junctions with interface roughness

Within the framework of Blonder-Tinkham-Klapwijk (BTK) model and taking into account the interface roughness, we calculate the differential conductance of normal metal-insulator- d-wave superconductor junctions. We find that the tunneling spectrum depends strongly on both the incident angle of elect...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 1996-04, Vol.260 (3), p.217-223
Main Authors: Zhu, Jian-Xin, Wang, Z.D., Xing, D.Y., Dong, Z.C.
Format: Article
Language:English
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Summary:Within the framework of Blonder-Tinkham-Klapwijk (BTK) model and taking into account the interface roughness, we calculate the differential conductance of normal metal-insulator- d-wave superconductor junctions. We find that the tunneling spectrum depends strongly on both the incident angle of electrons and the crystalline axis orientation of the superconductor, and exhibits the zero-bias anomaly under suitable arrangements. Interestingly, even in the absence of the insulating layer, the tunneling spectrum of normal metal- d-wave superconductor junctions differs significantly from that for normal metal- s-wave superconductor due to the interface roughness. Moreover, both the tunnel conductance peak at the energy gap and the zero-bias conductance peak are suppressed by the interface roughness. Our results can explain many experimental measurements on the tunneling spectra of high- T c superconductors.
ISSN:0921-4534
1873-2143
DOI:10.1016/0921-4534(96)00053-6