Directional tunneling and andreev reflection on YBa2Cu3O7-δ single crystals:: Predominance of d-wave pairing symmetry verified with the generalized Blonder, Tinkham, and Klapwijk theory

被引:361
作者
Wei, JYT [1 ]
Yeh, NC
Garrigus, DF
Strasik, M
机构
[1] CALTECH, Dept Phys, Pasadena, CA 91125 USA
[2] Boeing Phantom Works, Seattle, WA 98124 USA
关键词
D O I
10.1103/PhysRevLett.81.2542
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We report directional tunneling and point-contact spectroscopy measurements on the {100}, {110}, and {001} faces of YBa2Cu3O7-delta single crystals at 4.2 K. The conductance spectra show fully developed quasiparticle tunneling, Andreev reflection, and zero-bias peak characteristics, depending systematically on the junction orientation and impedance. Quantitative spectral analysis using the generalized formalism of Blender, Tinkham, and Klapwijk (BTK) indicates a predominantly d(x)(2)-y(2) pairing symmetry, with less than 5% s-wave component in either the d + s or d + is scenario. [S0031-9007(98)07041-0].
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页码:2542 / 2545
页数:4
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