  Ion implantation of Fe and Mn into Al thin films was used for effective
modification of Al superconductive properties. Critical temperature of the
transition to superconducting state was found to decrease gradually with
implanted Fe concentration. it was found that suppression by Mn implantation
much stronger compared to Fe. At low concentrations of implanted ions,
suppression of the critical temperature can be described with reasonable
accuracy by existing models, while at concentrations above 0.1 at.% a
pronounced discrepancy between the models and experiments is observed.
