Admixtures to d-Wave Gap Symmetry in Untwinned YBa2Cu3O7 Superconducting Films Measured by Angle-Resolved Electron Tunneling
H. J. H. Smilde, A. A. Golubov, Ariando, G. Rijnders, J. M. Dekkers, S. Harkema, D. H. A. Blank, H. Rogalla, H. Hilgenkamp
DOI 10.1103/PhysRevLett.95.257001 · Physical Review Letters
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Abstract
We report on an ab anisotropy of Jc∥b/Jc∥a≅1.8 and IcRn∥b/IcRn∥a≅1.2 in ramp-edge junctions between untwinned YBa2Cu3O7 and s-wave Nb. For these junctions, the angle θ with the YBa2Cu3O7 crystal b axis is varied as a single parameter. The RnA(θ) dependence presents twofold symmetry. The minima in IcRn at θ≅50° suggest a real s-wave subdominant component and negligible dxy-wave or imaginary s-wave admixtures. The IcRn(θ) dependence is well fitted by 83% dx2−y2-, 15% isotropic s-, and 2% anisotropic s-wave order parameter symmetry, consistent with Δb/Δa≅1.5.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89 | Pressure not reported | zero_resistance |
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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