Properties of submicron [001] tilt symmetric and asymmetric 45° bicrystal grain boundary junctions

We have fabricated and measured high-quality [100] Y-Ba-Cu-O grain boundary junctions in both symmetric and asymmetric configurations. High values of the critical current times normal resistance IcRn products have been systematically observed. The high IcRn values found in these junctions may be of interest for the fabrication of high-sensitive superconducting quantum interference devices.