Large-area uniform ultrahigh-JcYBa2Cu3O7-xfilm fabricated by the metalorganic deposition method using trifluoroacetates

Ultrahigh- J c YBa 2 Cu 3 O 7- x (YBCO) films have been successfully fabricated by the metalorganic deposition method using a trifluoroacetate coating solution which is prepared by a newly developed purification technique, the solvent-into-gel (SIG) method. The prepared pure coating solution has less than 0.25% impurities and has a wide flexibility in process conditions to obtain high- J c YBCO film. Using this feature, we have successfully formed 50 mm diameter YBCO films, which have a critical current density over 10 MA cm -2 (77 K, 0 T) on LaAlO 3 single crystalline substrates.