Keywords: magnetic property, superconductor, magnetic field
Summary:The critical transition temperature and critical current density of YBaCuO single crystal bulk were measured after heat diffusion treatment in nano powder. The superconducting start temperature was found to high at 91.62K. It can be seen that the critical current density and the critical temperature of the superconducting sample subjected to the thermal diffusion process are higher than those of the conventional superconducting sample. As a result of this study, it is found that the flux phase diffuses into the crystal grain boundaries through the oxygen diffusion path in the heat treatment process and 211 phase is generated inside the superconducting wire, thereby improving the superconducting flux effect and improving the superconducting transition temperature and critical current density. The diffusion heat treatment method of the flux material proposed in this study has the effect of improving the grain boundary state in the superconducting body by direct flux injection from the surface, thereby enhancing the flux pinning and increasing the superconducting transition temperature and the critical current density .This research was supported by the Korea Electric Power Corporation [Grant number: R16XA01].