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
J. Y. T. Wei, N.-C. Yeh, D. F. Garrigus, M. Strasik
DOI 10.1103/PhysRevLett.81.2542 · Physical Review Letters
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Abstract
We report directional tunneling and point-contact spectroscopy measurements on the {100}, {110}, and {001} faces of YBa2Cu3O7−δ 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 Blonder, Tinkham, and Klapwijk (BTK) indicates a predominantly dx2−y2 pairing symmetry, with less than 5% s-wave component in either the d+s or d+is scenario.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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