Abstract
Experimental results on stable point-contact Nb/Y-Ba-Cu-O structures are reported. Reproducible current-voltage characteristics showing Josephson coupling are obtained. Measurements of dV/dI give an estimate for the energy-gap value of the high-T/sub c/ superconductor Y-Ba-Cu-O ..delta.. = 19.5 +- 2.0 mV, corresponding to a ratio (2..delta..(0)/k/sub B/T/sub c/) = 4.8 in agreement with previous results obtained by a different technique.
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