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We synthesized a series of K0.8Fe2-xCoxSe2 samples with nominal compositions0\leq x\leq 0.035 and investigated their physical properties. The results showthat the superconductivity in K0.8Fe2-xCoxSe2 is quenched down to 5 K by 0.5at. % Co doping, the fastest quenching rate ever-reported. The role played hereby Co is in contrast with the one in FeAs based superconductors where Cousually induces superconductivity from parent compounds. Such a rapid quenchingfavors a localized 3d model against the itinerant one for iron pnictidesuperconductors.

Quenching of superconductivity by Co doping in K0.8Fe2Se2