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Measurements of the response of critical current of YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta///PrBa/sub 2/Cu/sub (3-x)/(Ga)/sub x/O/sub 7-/spl delta///YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// SNS edge Josephson junctions to external magnetic field reveal periodic dependence of critical current on magnetic field. Theoretically the shape of critical current versus magnetic field for uniform current flow across the junction should resemble a Fraunhofer diffraction pattern. Using analysis of depth of modulation as an indication of how well the experimental modulation pattern fits the diffraction model, our experiments show a correlation between the depth of modulation and the type of junction. RSJ-like I-V curves, with their sharp concave upward curvature and I/sub ex//I/sub c/<1, correlated with larger depth of modulation than flux flow-like I-V curves with their rounded concave downward curvature and I/sub ex//I/sub c/>1. Also the response of single junctions as a function of temperature is analyzed.
Date of Publication: June 1999