Critical current density for filamentary (Eu, Gd, Ho)123 superconductors

We have studied a fabrication of filamentary ternary RE123 superconductors by changing the RE element for pinning enhancement. In this paper, the Jc of the filamentary (Eu, Gd, Ho)123 superconductors prepared by solution spinning and partial melting under various atmospheres was examined. As the oxygen partial pressure decreased, the optimum melting temperature decreased. The Tc of the samples melted in flowing 0.1%O2 + Ar and 1%O2 + Ar was around 92 K and the Tc for the samples melted in flowing 20%O2 + Ar was low such as 83 K. The transport Jc values for the samples were measured at 77 K in applied magnetic fields up to 14 T by rotating the sample in a direction of the filament diameter. Anisotropic behavior of the field dependence of Jc along the filament diameter was detected. The highest Jc value of 4100 A/cm2 at 77 K and 14 T was detected for the sample melted in flowing 0.1%O2 + Ar. By the rotating the angle for 90 deg., the superconductivity at 77 K was disappeared by applying the field more than 8 T