Key elements have been made for superconducting electronics, crossovers and vias with the microwave compatible insulating material PrGaO/sub 3/. The critical temperatures of the top and bottom layers of YBa/sub 2/Cu/sub 3/O/sub 7/ for a crossover were 88 K and 85 K, respectively. The resistivity between the layers was 100 Omega -cm at 77 K for a 300-nm-thick insulator layer. This insulation was improved by growing 10-nm-thick layers of SiTiO/sub 3/ on both sides of the PrGaO/sub 3/ layer. In this case, the resistivity was 25 k Omega -cm at 77 K.>
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Nilsson et al. (1993) studied this question.
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