Nonsinusoidal Current-Phase Relationship of Grain Boundary Josephson Junctions in High- Tc Superconductors
E. Il'ichev, V. Zakosarenko, R. P. J. IJsselsteijn, V. Schultze, H.-G. Meyer, H. E. Hoenig, H. Hilgenkamp, J. Mannhart
DOI 10.1103/PhysRevLett.81.894 · Physical Review Letters
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Abstract
For various configurations of Josephson junctions incorporating superconductors with unconventional order parameter symmetry, such as most high- Tc cuprates, deviations from the standard sinusoidal current-phase dependence have been predicted. To this point, these deviations have never been observed experimentally. We have measured the current-phase relation of high- Tc Josephson junctions, namely, YBa2Cu3O7−x thin film bicrystals, comprising symmetric 45° [001] tilt grain boundaries. The current-phase relations of all junctions investigated were found to be extremely nonharmonic, in agreement with a dx2−y2-wave dominated symmetry of the order parameter.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 88 | Pressure not reported | onset |
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