High Temperature Josephson Bicrystal Junctions And Arrays For Metrological Applications

Concerning metrological applications of high-temperature superconductor (HTS) Josephson junctions, we investigated the properties of gold shunted bicrystal YBCO junctions on yttria-stabilized zirconia (YSZ) and sapphire substrates, We focus on three important items that are related to the problem of parameter spreads: (a) The control of the shunt resistance. This parameter is dominated by the contact resistivity between the YBCO and the hu. A direct method for the measurement of this crucial parameter was applied. (b) The impact of the shunt resistance and the spread in junction resistance on the tolerable junction size and the frequency working regime for metrological arrays, And (c) the realization of series arrays with a high packing density of junctions using electron-beam-patterning. The parameter spreads are comparable to those of standard lithography processed junctions.