MAGNETIZATION BEHAVIOUR FOR TEXTURED BULK YBaCuO POLYCRYSTALLINE SUPERCONDUCTORS

摘要

In present paper.study of magnetization behaviour was carried out for textured bulk YBaCuO polycrystalline superconductors synthesized by MTG process.Themagnetization behaviour apparently different from that of sintered samples was observed.Magnetization hysteresis measurements were performed for the texturedYBaCuO superconductors at 77K in ± 10kOe magnetic field range.Based on the results ofmagnetization hysteresis.the magnetic field dependence of critical current density(J)at77K was evaluated for the textured YBaCuO samples.The magnetic flux penetration intextured bulk YBaCuO polycrystalline superconductors was investigated at 77K throughthe magnetization hysteresis measurements under various maximum applied magnetic fields(H_M)and reasonable discussion for the phenomena was conducted in terms of Bean’s criti-cal state model.The enhancement of magnetic properties for textured bulk YBaCuOpolycrystalline superconductors is presumably attributed to the improvement ofmicrostructure in these samples.