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An extremely thin film is used in the superconductor-insulator-superconductor junction of Josephson effect elements. High heat-cycle resistance is required for the thin film. Pb system materials are widely used for the fabrication of Josephson tunnel junction elements. Pb thin films capable of withstanding the heat cycle can be obtained by doping In or Au. Josephson junction elements having a high resistance to the heat cycle can be implemented by using niobium system material. Josephson elements using this material, however, are poor in current-voltage characteristics compared to those using the Pb system material. The root of this disadvantage lies in the fact that the junction capacitance is larger than that of junctions using the Pb system material.