Electromagnetic properties and He+ irradiation effects on YBa2Cu3O7−x grain-boundary Josephson junctions
M. A. Navacerrada, M. L. Lucía, F. Sánchez-Quesada
DOI 10.1103/PhysRevB.61.6422 · Physical Review B
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Abstract
We have analyzed the electromagnetic properties of small and long YBa2Cu3O7−x grain-boundary Josephson junctions. The Swihart velocity increases with junction width (w) while the ratio of the relative dielectric constant to the barrier thickness (ɛ/t) decreases. We found that the product w×ɛ/t is approximately constant. These results have been explained in the framework of the filamentary model, where the barrier can be regarded as a disordered dielectric medium with a high density of superconducting filaments. Experiments demonstrate that a controllable variation of these parameters can be achieved by helium irradiation at 80 keV. We give examples of an enhancement of weak-link properties of junctions for doses in the range of 1013cm−2. Raising the dose we can sweep the modification of the weak-link properties from an increase of the junction critical current of about 10% to a severe degradation of the coupling energy of the barrier, although the superconducting properties of the electrodes always worsen gradually.
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. | 91 | Pressure not reported | onset |
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