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The formation of the magnetic moment in C- and N-doped MgO is the result of a delicate interplay
between Hund¡¯s coupling, hybridization, and Jahn¨CTeller distortion. The balance depends on a
number of environmental variables including electron doping. We investigate such a dependence by
self-interaction corrected density functional theory and we find that the moment formation is robust
with respect to electron doping. In contrast, the local symmetry around the dopant is more fragile
and different geometries can be stabilized. Crucially the magnetic moment is always extremely
localized, making any carrier mediated picture of magnetism in d0 magnets unlikely

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