Josephson effect above 77 K in a YBaCuO break junction

We have observed the Josephson effect in a YBaCuO break junction. Critical currents as high as 10 mA were measured at 4 K for break junctions with a point contact within the fracture of a sample. The junction was susceptible to microwave radiation showing Shapiro steps with the ratio of V/f of 2.04±...

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Bibliographic Details
Published in:Applied physics letters 1987-08, Vol.51 (7), p.540-541
Main Authors: MORELAND, J, GOODRICH, L. F, EKIN, J. W, CAPOBIANCO, T. E, CLARK, A. F, BRAGINSKI, A. I, PANSON, A. J
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:We have observed the Josephson effect in a YBaCuO break junction. Critical currents as high as 10 mA were measured at 4 K for break junctions with a point contact within the fracture of a sample. The junction was susceptible to microwave radiation showing Shapiro steps with the ratio of V/f of 2.04±0.05 μV/GHz compared to the pair tunneling value of h/2e=2.068 μV/GHz. These steps were clearly visible in the current-voltage characteristics at tempertures up to 85±5 K.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.98392