Field dependence of Jc for melt-processed filamentary Sm-Ba-Cu-O superconductors

The filamentary Sm123 precursor was prepared by a solution spinning method. The precursor was partially melted in flowing 0.1%O-2 + Ar and 1%O-2 + Ar. The transport J(c) value for the filamentary Sm123 superconductors was examined at 77 K in applied magnetic fields up to 10 T. The J(c) value higher than 10(4) A/cm(2) was maintained up to 4 T for the samples melted in flowing 1%O-2 + Ar. The J(c) value gradually decreased with increasing applied magnetic fields from 4 to 6 T and the superconductivity rapidly deteriorated by applying the fields above 8 T. On the contrary, the J(c) values drastically decreased for the samples melted in flowing 0.1%O-2 + Ar by applying the fields higher than 1 T, and the superconductivity at 77 K was disappeared around 4 T. (C) 2003 Elsevier B.V. All rights reserved.