Research Papers in Physics and Astronomy


Date of this Version

August 1997


Published by American Institute of Physics. Appl. Phys. Lett. 71, 1121(1997). © 1997 American Institute of Physics. Permission to use.


Bicrystal grain boundary Josephson junctions were fabricated in a stack of two layers of YBa2Cu3Oχ 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.

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