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Electromagnetic properties and He+ irradiation effects on YBa2Cu3O7-x grain-boundary Josephson junctions



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Lucía Mulas, María Luisa y Sánchez Quesada, Francisco y Navacerrada, M.A. (2000) Electromagnetic properties and He+ irradiation effects on YBa2Cu3O7-x grain-boundary Josephson junctions. Physical Review B, 61 (9). pp. 6422-6427. ISSN 1098-0121

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URL Oficial: http://dx.doi.org/10.1103/PhysRevB.61.6422

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We have analyzed the electromagnetic properties of small and long YBa2Cu3O7-x grain-boundary Josephson junctions. The Swihart velocity increases with junction width (rv) while the ratio of the relative dielectric constant to the barrier thickness (epsilon/t) decreases. We found that the product wX epsilon/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 10(13) cm(-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.

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© The American Physical Society. The authors would like to thank C. A. I. de Implantación Iónica from the Universidad Complutense in Madrid for assistance with ion implantation and lithography facilities. Financial support from CICYT Grant No. MAT97-0675 is acknowledged.

Palabras clave:Electron-Beam Irradiation, Reduced Critical Currents, Thin-Films, Transport-Properties, Bicrystals, Superconductors, Misorientation, Resonances, Scale.
Materias:Ciencias > Física > Electricidad
Ciencias > Física > Electrónica
Código ID:27385
Depositado:18 Nov 2014 11:41
Última Modificación:20 Nov 2014 09:31

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