High temperature superconducting Josephson junctions in a stacked bicrystal geometry

Authors

H.Q. Li, National Institute of Standard and Technology (NIST), Boulder, Colorado
R.H. Ono, National Institute of Standard and Technology (NIST), Boulder, Colorado
L.R. Vale, National Institute of Standard and Technology (NIST), Boulder, Colorado
D.A. Rudman, National Institute of Standard and Technology (NIST), Boulder, Colorado
Sy_Hwang Liou, University of Nebraska-LincolnFollow

Date of this Version

August 1997

Comments

Published by American Institute of Physics. Appl. Phys. Lett. 71, 1121(1997). © 1997 American Institute of Physics. Permission to use. http://jap.aip.org/jap/.

Abstract

Bicrystal grain boundary Josephson junctions were fabricated in a stack of two layers of YBa₂Cu₃O_χ separated by epitaxial SrTiO₃. Weak link behavior was observed in the bridges formed in both layers that had similar shunted-junction characteristics but significantly different critical currents. Characteristic voltages up to 1.9 mV were measured at 4.5 K. The resonant structure was seen in the current–voltage characteristics of the upper-layer junctions, and interactions between junctions in the two layers were evident.