Theory of local density of states in d-wave superconductors around rough surfaces

The spatial dependence of the local density of states (LDOS) of quasiparticles in a d x 2− y 2 -wave superconductor around the rough surfaces is investigated using an extended Hubbard model. The existence of the zero-energy states (ZES) is calculated at the corners of corrugations for nominal [100]...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 1997-12, Vol.293 (1), p.234-238
Main Authors: Tanuma, Yasunari, Tanaka, Yukio, Yamashiro, Masashi, Kashiwaya, Satoshi
Format: Article
Language:English
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Summary:The spatial dependence of the local density of states (LDOS) of quasiparticles in a d x 2− y 2 -wave superconductor around the rough surfaces is investigated using an extended Hubbard model. The existence of the zero-energy states (ZES) is calculated at the corners of corrugations for nominal [100] surfaces as well as on the ideal [110] surfaces. On the other hand, for flat [100] surface, no ZES are obtained. Even in the case of nominal [110] surfaces, when the intervals of the corners in zigzag structure are larger than the spread of Cooper pairs, the LDOS are not always enhanced at zero energy level. These results explain the wide variety of the spectra obtained in the tunneling experiments of high- T c superconductors.
ISSN:0921-4534
1873-2143
DOI:10.1016/S0921-4534(97)01547-5