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We report the successful growth and the impurity scattering effect of singlecrystals of Na(Fe$_{0.97-x}$Co$_{0.03}$T$_x$)As (T=Cu, Mn). The temperaturedependence of DC magnetization at high magnetic fields is measured fordifferent concentrations of Cu and Mn. Detailed analysis based on theCurie-Weiss law indicates that the Cu doping weakens the average magneticmoments, while doping Mn enhances the local magnetic moments greatly,suggesting that the former may be non- or very weak magnetic impurities, andthe latter give rise to magnetic impurities. However, it is found that bothdoping Cu and Mn will enhance the residual resistivity and suppress thesuperconductivity at the same rate in the low doping region, being consistentwith the prediction of the S$^{\pm}$ model. For the Cu-doped system, thesuperconductivity is suppressed completely at a residual resistivity $\rho_0$ =0.87 m$\Omega$ cm at which a strong localization effect is observed. However,in the case of Mn doping, the behavior of suppression to \emph{T}$_{c}$ changesfrom a fast speed to a slow one and keeps superconductive even up to a residualresistivity of 2.86 m$\Omega$ cm. Clearly the magnetic Mn impurities are evennot as detrimental as the non- or very weak magnetic Cu impurities tosuperconductivity in the high doping regime.

Impurity effect and suppression to superconductivity in Na(Fe$_{0.97-x}$Co$_{0.03}$T$_x$)As (T=Cu, Mn)