Break-junction tunneling measurements of the high-T_c superconductor Y₁Ba₂Cu₃O_{9- δ}

Authors

• J. Moreland, National Bureau of Standards, Electromagnetic Technology Division, Boulder, Colorado
• J.W. Ekin, National Bureau of Standards, Electromagnetic Technology Division, Boulder, Colorado
• L.F. Goodrich, National Bureau of Standards, Electromagnetic Technology Division, Boulder, Colorado
• T.E. Capobianco, National Bureau of Standards, Electromagnetic Technology Division, Boulder, Colorado
• A.F. Clark, National Bureau of Standards, Electromagnetic Technology Division, Boulder, Colorado
• J. Kwo, AT&T Bell Laboratories, Murray Hill, New Jersey
• M. Hong, AT&T Bell Laboratories, Murray Hill, New Jersey
• Sy_Hwang Liou, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

June 1987

Comments

Published by American Physical Society. Phys. Rev. B35, 8856 (1987). http://prb.aps.org. Copyright © 1987 American Physical Society. Permission to use.

Abstract

Current-voltage tunneling characteristics in a high-critical-temperature superconducting material containing predominately Y₁Ba₂Cu₃O_{9- 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/k_BT_c=4.8 at T=4 K, for a critical temperature of 93 K (midpoint of the resistive transition).