The YBaCuO superconductors prepared by the Melt-Powder-Melt-Growth (MPMG) process show high J
c characteristics at high magnetic fields and high temperatures. Since the high J
c property is very important for high-field applications, these materials are expected to be applied to high-field applications such as for bulk superconducting magnets, current leads, magnetic levitation systems and so on. In this study, we investigated the temperature and magnetic-field dependences of the critical current density, J
c, in YBaCuO superconductors prepared by the MPMG process at a magnetic field of up to 5.5T in the temperature range of 5 to 90K. We estimated the scaling parameters of J
c (B, T) based on the present result that the precipitates consisting of the 211 phases work as effective pinning centers. We also estimated the J
c anisotropy of the superconductor between the c axis direction and directions in the (a, b) plain.
抄録全体を表示