Abstract
Among the high-temperature superconductors, Bi-based superconductors have critical temperature exceeding 100K and resources used for them are relatively widely available since they contain no rare-earth elements. The autors have made attempts to improve the critical current density of silver-sheathed Bi-based superconducting wires, and successfully achieved a superconductor with critical current densities as high as 3.2×104A/cm2 in a zero magnetic field, 2.3×104A/cm2 at 0.1 T and 6×10 3A/cm2 at 1 T at 77K. They also succeeded to make long conductors and strain-resistant multi-filamentally wires.
