High critical current density in RE–Ba–Cu–O bulk superconductors with very fine RE2BaCuO5 particles

Growth Rate and Superconducting Properties of Gd-Ba-Cu-O Bulk Superconductors Melt Processed in Air

“…, where LRE is a light rare earth element such as Nd, Sm, Eu and Gd, are known to exhibit higher critical current densities, 's, and higher irreversibility fields than Y-Ba-Cu-O (YBCO) [1]- [3]. However, it has not been possible to date to fabricate (LRE)BCO single grains in air using a practical growth technique, such as top seeding melt growth (TSMG), due primarily to the absence of a suitable seed crystal.…”

Nanocomposite RE-Ba-Cu-O Bulk Superconductors

“…In order to prepare fine LRE-211 precursor powders, employing a low calcinations temperature in synthesis of LRE-211 has been proposed and indeed fine Gd-211 powders with an average size of 1.0 µm have been obtained [24]. As a result, J c -B characteristics of GdBCO sample prepared from such fine powder have been improved significantly.…”

Improvement of Critical Current Density and Flux Trapping in Bulk High-Tc Superconductors

“…The flux pinning and Jc performance of a RE-Ba-Cu-O bulk yield remarkable improvements by dispersing the non-superconducting secondary pinning phase into the RE-123 matrix. Successful attempts have been made to add nano-sized impurities [22,23,31], the fined RE211s [32,33] and Pt, Ce additives to prevent the Ostwald ripening of RE-211 inclusions into the precursors and to enhance flux pinning. On the other hand, compared with core pinning by normal non-superconducting particles, the use of ferromagnetic pinning centres results in interactions between a magnetic dipole moment and flux lines, which yields a potential Upin proportional to -mb, where m is the moment of magnetic dipole and b is the field of the vortex at the distance of the dipole [34].…”