Microstructure and Transport Properties of Oxide Superconductors

摘要: Microstructural control is crucial to improve transport critical current density in oxide superconductors. Bulk sintered materials contain a number of defects such as porosities, second phases, cracks, impurities, variation chemical composition and other grain boundary defects. All these reduce The can be minimized by controlling the processing conditions. However we have found that weak-link effects cannot completely eliminated from material far employ solid state reaction. This confirmed sharp degradation Jc magnetic field. No sample size dependence magnetization hysteresis between increasing decreasing field process also indicates supercurrent localizes intragranularly.