OXIDE SUPERCONDUCTOR

摘要

An oxide superconductor comprising an oxide which contains bismuth, lead, strontium, calcium and copper as constituent metal elements, and having an inner structure in which a region having a relatively high concentration of lead and not having a long cyclic structure is included in a region containing lead with a mole ratio larger than a lead-to-bismuth mole ratio of 0.2:1 and having a relatively low concentration of lead and a long cyclic structure. This oxide superconductor has a large pinning force and a high critical current density Jc even at a high temperature and even in a high magnetic field. This oxide superconductor can be manufactured by an industrial method, and enables wire rods to be formed easily.