Abstract
We have extended the off-axis biepitaxial technique to produce YBCO grainboundary junctions on low loss substrates. Excellent transport propertieshave been reproducibly found, with remarkable values of the quality factorIcRn (withIc the criticalcurrent and Rn the normal state resistance) above 10 mV, far higher than the values commonly reported inthe literature for high temperature superconductor (HTS) based Josephson junctions. Theoutcomes are consistent with a picture of a more uniform grain boundary region along thecurrent path. This work supports a possible implementation of grain boundary junctionsfor various applications including terahertz sensors and HTS quantum circuits in thepresence of microwaves.
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