Angular Position of Nodes in the Superconducting Gap of YBCO
H. Aubin, K. Behnia, M. Ribault, R. Gagnon, L. Taillefer
DOI 10.1103/PhysRevLett.78.2624 · Physical Review Letters
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Abstract
The thermal conductivity of a YBa2Cu3O6.9 detwinned single crystal has been studied as a function of the relative orientation of the crystal axes and a magnetic field rotating in the Cu-O planes. Measurements were carried out at several different temperatures below Tc for a field of 30 kOe. A fourfold symmetry characteristic of a superconducting gap with nodes at odd multiples of 45° in k space was resolved. Experiments were performed to exclude a possible macroscopic origin for such a fourfold symmetry and our results impose an upper limit of 10% on the weight of the s-wave component of the essentially d-wave superconducting order parameter of YBCO.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6.9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | onset |
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