Superconductivity suppression of Ba 0.5 K 0.5 Fe 2−2x M 2x As 2 single crystals by substitution of transition-metal (M = Mn, Ru, Co, Ni, Cu, and Zn) 5 Department of Chemistry, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan. 6 Department of Physics, Nagoya University, Furo-cho, Nagoya 464-8602, Japan.(Dated: June 6, 2012)We investigated the doping effects of magnetic and nonmagnetic impurities on the singlecrystalline p-type Ba0.5K0.5Fe2−2xM 2xAs2 (M = Mn, Ru, Co, Ni, Cu and Zn) superconductors. The superconductivity indicates robustly against impurity of Ru, while weakly against the impurities of Mn, Co, Ni, Cu, and Zn. However, the present T c suppression rate of both magnetic and and nonmagnetic impurities remains much lower than what was expected for the s±-wave model. The temperature dependence of resistivity data is observed an obvious low-T upturn for the crystals doped with high-level impurity, which is due to the occurrence of localization. Thus, the relatively weak T c suppression effect from Mn, Co, Ni, Cu, and Zn are considered as a result of localization rather than pair-breaking effect in s±-wave model.