Research Papers in Physics and Astronomy


Date of this Version

June 1987


Published by American Physical Society. Phys. Rev. B35, 8856 (1987). Copyright © 1987 American Physical Society. Permission to use.


Current-voltage tunneling characteristics in a high-critical-temperature superconducting material containing predominately Y1Ba2Cu3O9- δ have been measured using the break-junction technique. Sharp gap structure was observed, with the largest superconductive energy gap measured to be Δ=19.5±1 meV, assuming a superconductor-insulator-superconductor junction. This energy gap corresponds to 2Δ/kBTc=4.8 at T=4 K, for a critical temperature of 93 K (midpoint of the resistive transition).

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