Effect of low-temperature ion irradiation on the spin glassCuMn

Low-temperature (T<10 K) ion bombardment with He and Ar ions was used to introduce disorder into a ${\mathrm{Cu}}_{97.8}$ ${\mathrm{Mn}}_{2.2}$ thin-film spin glass. In this way the mean free path of the conduction electrons could be varied, and by an in situ measurement of the freezing temperature $T_f$, the corresponding $T_f$ changes were determined. A decrease of $T_f$ was observed for increasing resistivity ρ, exhibiting a linear relation between ln$T_f$ and ρ. Such a behavior can be interpreted in terms of a damped Ruderman-Kittel-Kasuya-Yosida interaction.