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Mn2+ ion doping is used as an electron paramagnetic resonance (EPR) probe toinvestigate the influence of low-coordination structural defects such as stepedges at the surface of terraced (001) MgO nanoparticles on the electronicproperties. Beside the well-known hyperfine sextet of Mn2+ ions in the cubiccrystal field of MgO, an additional EPR feature with a striking non-monotonoustemperature dependent shift of the g-factor is observed in terracednanoparticles in the temperature range from 4K to room temperature. By linkingthe difference in the temperature dependence of the Mn2+ sextet intensity incubic and terraced nanoparticles with the possible s-d exchange shift andenhanced Zeeman splitting we conclude that the novel EPR feature originatesfrom the loosely trapped charge-compensating carriers at the abundantstructural defects at the surface of terraced nanoparticles due to theirexchange interaction with neighboring Mn2+ ions.

A low-field temperature-dependent EPR signal in terraced MgO:Mn2+ nanoparticles: an enhanced Zeeman splitting in the wide-bandgap oxide