Abstract
The YBaCuO superconductors prepared by the Melt-Powder-Melt-Growth (MPMG) process show high Jc characteristics at high magnetic fields and high temperatures. Since the high Jc 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, Jc, 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 Jc (B, T) based on the present result that the precipitates consisting of the 211 phases work as effective pinning centers. We also estimated the Jc anisotropy of the superconductor between the c axis direction and directions in the (a, b) plain.
