Abstract
The evolution of the optical branch in the Raman spectra of (Ga,Mn)N:Mg epitaxial layers as a function of the Mn and Mg concentrations, reveals the interplay between the two dopants. We demonstrate that the various Mn-Mg-induced vibrational modes can be understood in the picture of functional Mn--Mg complexes formed when substitutional Mn cations are bound to substitutional Mg through nitrogen atoms, the number of ligands being driven by the ratio between the Mg and the Mn concentrations.
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