Valence, exchange interaction, and location of Mn ions in polycrystalline MnxGa1−xN (x = 0.04)

Furrer, Albert; Krämer, Karl; Podlesnyak, A; Pomjakushin, V; Sheptyakov, Denis; Safonova, O.V. (2018). Valence, exchange interaction, and location of Mn ions in polycrystalline MnxGa1−xN (x = 0.04). Physical review. B - condensed matter and materials physics, 97(14) American Physical Society 10.1103/PhysRevB.97.140102

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We present an experimental study for polycrystalline samples of the diluted magnetic semiconductor
MnxGa1−xN (x 0.04) in order to address some of the existing controversial issues. X-ray and neutron
diffraction, x-ray absorption near-edge structure, and electron paramagnetic resonance experiments were used to
characterize the structural, electronic, and magnetic properties of the samples, and inelastic neutron scattering
was employed to determine the magnetic excitations associated with Mn monomers and dimers. Our main
conclusions are as follows: (i) The valence of the Mn ions is 2+. (ii) The Mn2+ ions experience a substantial
single-ion axial anisotropy with parameter D = 0.027(3) meV. (iii) Nearest-neighbor Mn2+ ions are coupled
antiferromagnetically. The exchange parameter J = −0.140(7) meV is independent of the Mn content x; i.e.,
there is no evidence for hole-induced modifications of J towards a potentially high Curie temperature postulated
in the literature.

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