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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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Published in: | Physica. C, Superconductivity Superconductivity, 1996-04, Vol.260 (3), p.217-223 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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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. |
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ISSN: | 0921-4534 1873-2143 |
DOI: | 10.1016/0921-4534(96)00053-6 |