Advanced HTS S-N-S Devices
Final rept. 1 Jul-24 Dec 1992
CONDUCTUS INC SUNNYVALE CA
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Superconductor-normal-superconductor Josephson junctions are a prime candidate for the active devices in electronic circuits based on high- temperature superconductors. In this program, CaRuO3 was used as a normal metal layer and yttrium barium copper oxide as the superconducting layers to produce Josephson junctions in edge-junction geometry. These superconductor-normal- superconductor junctions have been studied to determine their suitability for use in integrated circuits. The devices worked as Josephson junctions at temperatures up to at least 77 K with characteristic voltages in the range of 100-750 microvolts over most of their operating temperature range. The resistance of the junctions was dominated by the interface region rather than by the barrier layer itself. The properties of dc SQUIDs made from the junctions were excellent at 77 K. The variation in junction parameters over multiple devices was on the order of plus-or-minus thirty percent, which is encouraging but not yet sufficient for integrated circuit applications. Further process refinements may lead to more desirable device uniformity.
- Electrical and Electronic Equipment