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75As nuclear magnetic resonance (NMR) experiments were performed onBa(Fe1-xMnx)2As2 (xMn = 2.5%, 5% and 12%) single crystals. The Fe layermagnetic susceptibility far from Mn atoms is probed by the75As NMR line shiftand is found similar to that of BaFe2As2, implying that Mn does not inducecharge doping. A satellite line associated with the Mn nearest neighbours(n.n.) of 75As displays a Curie-Weiss shift which demonstrates that Mn carriesa local magnetic moment. This is confirmed by the main line broadening typicalof a RKKY-like Mn-induced staggered spin polarization. The Mn moment is due tothe localization of the additional Mn hole. These findings explain why Mn doesnot induce superconductivity in the pnictides contrary to other dopants such asCo, Ni, Ru or K.

Mn local moments prevent superconductivity in iron-pnictides Ba(Fe 1-x Mn x)2As2