Abstract
We studied effects of 3-MeV gold-ion irradiation on critical current density (Jc) in YBa2Cu3O7 films prepared by three different deposition methods: fluorine-free metal-organic deposition, thermal co-evaporation, and metal-organic chemical-vapor deposition. The three films showed strikingly distinct responses to the extrinsic pinning-center introduction in their Jc values in magnetic fields, namely, about 300%, 70%, and no enhancement in the above order. Transmission electron microscopy results suggest that this characteristic process dependence is closely related to the microstructure of the as-deposited films.
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