| 摘要 |
PURPOSE:To obtain practically sufficient characteristics by utilizing the characteristics of a ceramic superconductor thin-film. CONSTITUTION:Source-drain electrodes are arranged onto the mixed group regions 1 of electrically strongly bonded metal and ceramic superconductor, and a gate electrode is formed onto an electrically weakly bonded ceramic superconductor region 2. That is, oxide superconductor thin-films can be shaped through a sputtering method, an evaporation method, etc., but these thin-films consist of the aggregates of crystallites, and sections among crystallites are composed of electrically weakly bonded Josephson junctions. Consequently, the critical currents Jc of the oxide superconductor thin-film is reduced extremely though the oxide superconductor thin-film has a large critical magnetic field Hc. A normal metal is diffused among crystallite particles, and bonding is strengthened. Accordingly, superconductor particles separated at distances of approximately 1000Angstrom are coupled firmly by the proximity effect of superconductor-metal-superconductor, thus increasing a critical current value.
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