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

Furrer, A.; Kramer, K. W.; Podlesnyak, A.; Pomjakushin, V.; Sheptyakov, D.; Safonova, O. V.

doi:10.1103/PhysRevB.97.140102

Valence, exchange interaction, and location of Mn ions in polycrystalline $M n_{x} G a_{1 - x} N (x \leq 0.04)$

Journal Article · Tue Apr 10 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.97.140102· OSTI ID:1435214

Furrer, A. ^[1]; Kramer, K. W. ^[2]; Podlesnyak, A. ^[3]; Pomjakushin, V. ^[1]; Sheptyakov, D. ^[1]; Safonova, O. V. ^[4]

Paul Scherrer Inst. (PSI), Villigen (Switzerland). Lab. for Neutron Scattering
Univ. of Bern (Switzerland). Dept. of Chemistry and Biochemistry
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
Paul Scherrer Inst. (PSI), Villigen (Switzerland)

In this paper, we present an experimental study for polycrystalline samples of the diluted magnetic semiconductor $$\mathrm{M}{\mathrm{n}}_{x}\mathrm{G}{\mathrm{a}}_{1{-}x}\mathrm{N}(x{\le}0.04)$$ 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 $$\mathrm{M}{\mathrm{n}}^{2+}$$ ions experience a substantial single-ion axial anisotropy with parameter D = 0.027(3) meV. (iii) Nearest-neighbor $$\mathrm{M}{\mathrm{n}}^{2+}$$ ions are coupled antiferromagnetically. Finally, the exchange parameter $$J={-}0.140(7)\mathrm{meV}$$ 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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Paul Scherrer Inst. (PSI), Villigen (Switzerland)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1435214

Alternate ID(s):: OSTI ID: 1432574

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 14 Vol. 97; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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