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We present an experimental study for polycrystalline samples of the dilutedmagnetic semiconductor Mn(x)Ga(1-x)N (x<0.04) in order to address some of theexisting controversial issues. Different techniques were used to characterizethe electronic, magnetic, and structural properties of the samples, andinelastic neutron scattering was employed to determine the magnetic excitationsassociated with Mn monomers and dimers. Our main conclusions are as follows:(i) The valence of the Mn ions is 2+. (ii) The Mn(2+) ions experience asubstantial single-ion axial anisotropy with parameter D=0.027(3) meV. (iii)Nearest-neighbor Mn(2+) ions are coupled antiferromagnetically. The exchangeparameter J= 0.140(7) meV is independent of the Mn content x, i.e., there is noevidence for hole-induced modifications of J towards a potentially high Curietemperature postulated in the literature.

Valence, exchange interaction, and location of Mn in polycrystalline Mn(x)Ga(1-x)N (x<0.04)