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An oxide superconductor current lead in which generation of Joule heat at joint portions with a system side conductor and a power supply side conductor is reduced with use of an oxide superconductor with less heat penetration into a super conducting equipment system is provided. A columnar oxide sup

An oxide superconductor current lead in which generation of Joule heat at joint portions with a system side conductor and a power supply side conductor is reduced with use of an oxide superconductor with less heat penetration into a super conducting equipment system is provided. A columnar oxide superconductor molten bodies (interelectrode superconductor 260, in-electrode superconductors 280a and 280b) are produced, the in-electrode superconductor 280a and a left end portion of the interelectrode superconductor 260 are placed into a power supply side metallic electrode 210, and the in-electrode superconductor 280b and a right end portion of the interelectrode superconductor 260 are similarly placed in a system side metallic electrode 211, then degassed joining metal is used to join them to form an oxide superconductor current lead 201, a power supply side conductor 5 from a power supply is joined to the power supply side metallic electrode 210, and a system side conductor 202 from a superconducting system side is joined to the system side metallic electrode 211 with use of respective clamps 203a and 203b.

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What is claimed is: 1. An oxide superconductor current lead in which metallic electrodes are provided at both sides of a rare-earth based oxide superconductor manufactured by a melting method, joining metal is provided at joint portions formed by said oxide superconductor and said metallic electrod

What is claimed is: 1. An oxide superconductor current lead in which metallic electrodes are provided at both sides of a rare-earth based oxide superconductor manufactured by a melting method, joining metal is provided at joint portions formed by said oxide superconductor and said metallic electrodes, and said oxide superconductor and said metallic electrodes are joined by the joining metal, wherein a volume of holes in the joining metal provided at the joint portions is 5% or less of a volumetric capacity of the joint portions, and a current resistance value is 0.5 μΩ or less when a current of 1000 A is flown. 2. The oxide superconductor current lead according to claim 1, wherein silver coat is provided on a surface of said oxide superconductor joined by the joining metal. 3. The oxide superconductor current lead according to claim 1, wherein the joining metal is solder including one or more kind or kinds of cadmium, zinc, and antimony, and one or more kind or kinds of lead, tin, and indium. 4. A superconducting system, wherein the oxide superconductor current lead according to claim 1. 5. An oxide superconductor current lead which is provided with metallic electrodes at both ends of a rare-earth based oxide superconductor manufactured by a melting method, and transfers a current from and to mating conductors joined to said metallic electrodes, wherein in at least one of said metallic electrodes, said metallic electrodes and the mating conductors are disposed so as to be overlapped on each other, and a surface area of this overlapped part is larger than a sum of sectional areas of the metallic electrodes and sectional areas of the mating conductors. 6. The oxide superconductor current lead according to claim 5, wherein said oxide superconductor has a columnar shape, and is placed so that a longitudinal direction thereof is substantially in parallel with the interface. 7. The oxide superconductor current lead according to claim 5, wherein said oxide superconductor is an oxide superconductor produced by a melting method. 8. The oxide superconductor current lead according to claim 5, wherein said oxide superconductor is an oxide superconductor made by joining a plurality of oxide superconductors. 9. The oxide superconductor current lead according to claim 5, wherein said metallic electrodes and said one or more superconductor or superconductors are joined by joining metal, and wherein a volume of holes in the joining metal constitutes 5% of a volumetric capacity of joint portions or less. 10. A superconducting system, wherein the oxide superconductor current lead according to claim 5.