Flux Pinning and Properties of Solid-Solution (Y,Nd)1+xBa2-xCu3O7-delta Superconductors (Preprint).

摘要

The effect of chemical composition variations on the flux pinning and physical properties of (Y,Nd)1+xBa2-xCu3O7-delta superconductors was studied in powders processed by solid-state reaction and equilibrated in air at 910 deg C. An extended region of single-phase assemblages was determined for compounds with Ba = 2.0 to 1.7 and Nd = 0 to 1.3. At 77 K, Ba substituted and (Y0.2Nd0.8)Ba2Cu3O7-delta compounds had enhanced pinning properties (normalized Jc(H)) than other compositions tested including YBa2Cu3O7-delta. At 65 K, all compounds had similar pinning as Y123 (Nd = 0), except for composition (Y0.3Nd0.6)Ba1.9Cu3O7-delta which had reduced pinning. For increasing Nd and decreasing Ba.