Preparation of High-Jc Ba₂YCu₃O7-y Films on SrTiO₃ (100) Substrates by the Dipping-Pyrolysis Process at 750°C

Superconducting Ba 2 YCu 3 O 7- y films were prepared on SγTiO 3 (100) substrates by the dipping-pyrolysis process using metal acetylacetonates as starting materials. Prefired films were heat-treated at 750°C under a low-oxygen partial pressure ( p (O 2 )=2×10 -4 atm) and then annealed in O 2 . The resulting films showed high superconducting transition temperatures; both of the values of T c,onset (s) and T c,zero (r) were 89 K. The current-voltage characteristics of the films were measured at 74-86 K. The critical current at 77 K and 0 T was 2.4 A, which corresponds to the critical-current density of 3.9×10 5 A/cm 2 .