| 摘要 |
<p>A superconductive wire wherein the superconductive wire has a core portion (40) containing magnesium diboride as the main component and a continuous metallic sheath firmly adhered to the core portion (40); the core portion (40) is kept substantially vacuum; and the content of an inert gas such as an Ar gas contained in the core portion is in the range of 0.00002 to 10 ppm. Further, disclosed is a method for producing a superconductive wire, wherein the method comprises the steps of mixing powder of a source material constituting magnesium diboride to form a core portion (40) of the superconductive wire in an inert gas, filling a pipe with the mixed material powder in vacuum environment, sealing the pipe with vacuum after filled with the material powder, forming magnesium diboride powder by heating the vacuum-sealed pipe (sheath), and forming the core portion (40) by wiredrawing the pipe in the state where the magnesium diboride powder is sealed with vacuum, and the core portion (40) firmly sticks to the wiredrawn metallic pipe. The core portion (40) is kept vacuum, and the content of an inert gas contained in the core portion (40) is in the range of 0.00002 to 10 ppm.
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