Thick superconducting films of grown by photoassisted metalorganic chemical vapor deposition that have shown a decrease of with increasing thickness (>1 μm) have been exposed to ion irradiation in an attempt to enhance A 4.5 μm thick film irradiated with 1 MeV protons at a dose of has shown an increase of by a factor of nearly corroborating the proposal that a lack of pinning centers in the grown thick films, due to their high crystalline quality, contributed to the observed decrease of with increasing film thickness.
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