Field dependence of J_c for melt textured filamentary Nd123 superconductor

Filamentary Nd123 superconductors were produced by solution spinning and oxygen controlled melt growth process. A transport critical current density, J_c for the filamentary Nd123 sample prepared with various conditions was examined in magnetic fields up to 10 T at 77 K. Currents were passed along the fiber axis and were always normal to the applied magnetic field. The filamentary Nd123 superconductor exhibited Jc values larger than the filamentary Y123 superconductor in high fields. An anomalous peak effect was not observed for the J_c-H curve of the Nd123 samples and Jc values were strongly dependent on the composition of the precursor and oxygenation condition. By controlling the melt growth process and post-annealing condition, high J_c values exceeding 10⁴ A/cm² at 77 K and O T and > 10³ A/cm² at 10 T were achieved for the filamentary Nd_1.18Ba_2.12Cu_3.09O_x superconductor prepared in flowing 1%O₂ + Ar.