Critical current density in filamentary (Nd, Sm, Eu, Gd)-Ba-Cu-O superconductors prepared by a solution spinning method

The filamentary (Nd, Sm, Eu, Gd)-Ba-Cu-O (LRE123) precursor was prepared by the solution spinning method, through a homogeneous aqueous solution conta ining mixed acetates of Nd, Sm, Eu, Gd, Ba, and Cu, poly(vinyl alcohol) and organic acids. The filamentary sample was partially melted at 980 degrees C in flowing 0.1% O-2 + Ar and oxygenated under various conditions. The tra nsport critical current density (J(c)) for the samples was examined in magn etic fields up to 10 T at 77 K. The highest J(c) value of more than 1 X 10( 4) A/cm(2) at 77 K and 9 T was achieved for the filamentary Nd0.295Sm0.295G d0.295Ba2.12Cu3.09Ox superconductors by controlling the oxygenation conditi ons. (C) 2000 Elsevier Science B.V. All rights reserved.