High Tc superconductor-normal-superconductor Josephson junctions using CaRuO3 as the metallic barrier

Josephson junctions of the SNS type have been fabricated in the edge and trilayer junction geometries using YBa2Cu3O(7-delta) /CaRuO3/YBa2Cu3O(7-delta). The conducting oxide CaRuO3 was chosen because it grows epitaxially on YBa2Cu3O(7-delta) and its resistivity shows metallic behavior. Current-volta...

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Bibliographic Details
Published in:Applied physics letters 1993-01, Vol.62 (2), p.196-198
Main Authors: CHAR, K, COLCLOUGH, M. S, GEBALLE, T. H, MYERS, K. E
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Physics
Proximity effects, weak links, tunneling phenomena, and josephson effects, adreev effect, sn and sns junctions
Superconductivity
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Summary:Josephson junctions of the SNS type have been fabricated in the edge and trilayer junction geometries using YBa2Cu3O(7-delta) /CaRuO3/YBa2Cu3O(7-delta). The conducting oxide CaRuO3 was chosen because it grows epitaxially on YBa2Cu3O(7-delta) and its resistivity shows metallic behavior. Current-voltage characteristics display behavior with significant deviations from the resistivity shunted junction model. The dependence of critical currents and junction resistances on the CaRuO3 thickness suggest that the interface resistance between YBa2Cu3O(7-delta) and CaRuO3 plays an important role in determining the critical parameters of the junctions. A dc SQUID functioning at 77 K has been demonstrated with this type of junction. (Author)
ISSN:0003-6951
1077-3118
DOI:10.1063/1.109313