Abstract
We report the effect of doping Mn in the isostructural ${\mathrm{MgCNi}}_{3\ensuremath{-}x}{\mathrm{Mn}}_{x}$ $(x=0--0.05)$ compounds. Magnetic susceptibility, resistivity, magnetoresistance, and specific heat studies show evidence of localized moments and Kondo effect in samples with $x\ensuremath{\ne}0.$ The rapid suppression of superconductivity $(\ensuremath{\sim}\ensuremath{-}21\mathrm{K}/\mathrm{a}\mathrm{t}.%$ Mn) in these compounds is a consequence of pair breaking effects due to moment formation on Mn.
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