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We report the effect of 3 MeV proton irradiation on the suppression of thecritical temperature $T_{c}$ in Ba(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$ singlecrystals at under-, optimal-, and over-doping levels. We find that $T_{c}$decreases and residual resistivity increases monotonically with increasingdose. We also find no upturn in low-temperature resistivity in contrast withthe $\yen alpha$-particle irradiated NdFeAs(O,F), which suggests that defectsinduced by the proton irradiation behave as nonmagnetic scattering centers. Thecritical scattering rate for all samples estimated by three different ways ismuch higher than that expected in $s_{\yen pm}$-pairing scenario based oninter-band scattering due to antiferro-magnetic spin fluctuation.

Suppression of critical temperature in Ba(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$ with point defects introduced by proton irradiation