Angle-resolved Andreev bound states in anisotropic d-wave high-Tc YBa2Cu3O7−y superconductors
I. Iguchi, W. Wang, M. Yamazaki, Y. Tanaka, S. Kashiwaya
DOI 10.1103/PhysRevB.62.R6131 · Physical Review B
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Abstract
An unusual technique utilizing the two-dimensional junction configuration is introduced to study the pairing symmetry of a YBa2Cu3O7−y cuprate superconductor. The zero bias conductance peak due to the Andreev bound states was measured for the YBa2Cu3O7−y/I/Ag ramp-edge tunnel junctions with different crystal-interface boundary angles fabricated on the same chip. It was found to develop monotonically as the angle was increased and became a maximum at 45°. Two gaplike structures were also found at the intermediate angle of 30°. The result implies that dx2−y2-wave pairing symmetry predominates in this cuprate.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure unresolved | unknown |
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