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

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).