| 摘要 |
An oxide superconductor current lead provided with a rod-like or pipe-like oxide superconductor, at each of end parts of which a metallic electrode is formed. In this oxide superconductor current lead, the oxide superconductor is a Bi2Sr2Ca2Cu3OX superconductor. Further, the metallic-electrode-portion contact resistivity thereof is not more than 0.05 muOMEGA.cm2. Moreover, the critical current density is not less than 2,000 A/cm2. Furthermore, there is provided a method of manufacturing such an oxide superconductor current lead. To perform this method, optimum conditions for conducting a heat treatment when forming electrodes at both ends of an oxide superconductor current lead are detected. Thereby, the contact resistivity during a superconducting coil becomes extremely small. Further, the critical current density is considerably enhanced. In the case of this method, an oxide superconductor (8) obtained by finishing a final sintering process is first worked into or shaped like a rod or a pipe. Then, metallic electrode portions (9) are formed by winding metallic foil around end parts of the superconductor, or by applying metallic paste thereto, or by performing a physical vapor phase epitaxy process such as a sputtering process or an evaporation process. Subsequently, a heat treatment is performed on the metallic electrode portions at a temperature, which is in a 810 to 830° C. range, for a time period of 2 to 20 hours. Thus, an oxide superconductor current lead is obtained.
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