We have studied the effect of Zr addition on the field dependence of transport Jc for filamentary (Nd - Eu - Gd)Ba2Cu 3Ox superconductors to enhance the flux pinning. We prepared the filamentary (Nd0.33Eu0.38Gd 0.28)Ba2Cu3OxZry (y = 0, 0.001, 0.002) precursors by a solution spinning method. The precursor was partially melted in flowing 0.1%O2 + Ar under various heating conditions to obtain high Jc value. The optimum heating condition was dependent on sample diameter. A maximum Jc value of 3 × 104 A/cm2 at 77 K and self-field was attained for the sample with 0.001 at% Zr. The samples had well aligned texture along the filament diameter as well as the length. The Jc was measured at 77 K in applied magnetic fields up to 14 T by rotating the sample along the direction perpendicular to the filament length. Anisotropic behavior of the field dependence of Jc was detected. Although the Jc values measured at the optimum angle for the samples with 0.001 at% Zr decreased with increasing the applied fields above 10 T, the Jc values for the Zr addition samples were higher than that for the non addition sample by applying the fields up to 11 T.
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