Abstract:
Radioactive In has been incorporated into oriented thin films of YBa₂Cu₃O₇₋δ during a
thermal coevaporation process. The hyperfme technique of perturbed γγ-angular correlation
spectroscopy shows that 60% of the indium substitutes at a single site in the superconductor. We
obtain spectra with reasonable statistics from 2 mCi of starting material, about 1% of which is
incorporated into the film. Other methods of incorporating indium into films and bulk
YBa₂Cu₃O₇₋δ have often resulted in a significant amount of indium being incorporated into
impurity phases.
