Abstract
A novel multilayer structure composed of a NBCO groundplane and stannate isolation layers was fabricated in order to improve the quality of Josephson characteristics and wiring layers on a buried groundplane. The fabricated junctions exhibited high magnetic modulation of I c exceeding 90% and an I c R n product of 0.75 mV at 30 K. The sheet inductances of the counter-electrode and the base-electrode wiring were 1.1 and 1.3 pH, respectively, nearly independent of a temperature ranging from 20 to 30 K. We also fabricated an HTS-SFQ ring oscillator circuit including 21 junctions by adopting this novel multilayer and confirmed a proper operation of the ring oscillator at 20–30 K. The maximum output voltage of the ring oscillator was observed to be 0.06 mV at 30 K and 0.12 mV at 20 K, indicating the signal delay time per stage to be 3.4 and 1.8 ps, respectively.
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