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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Krämer, Karl

Subjects:

500 Science > 530 Physics
500 Science > 540 Chemistry

ISSN:

1098-0121

Publisher:

American Physical Society

Funders:

[42] Schweizerischer Nationalfonds

Language:

English

Submitter:

Karl Krämer

Date Deposited:

20 Jul 2018 13:46

Last Modified:

22 Oct 2019 23:58

Publisher DOI:

10.1103/PhysRevB.97.140102

ArXiv ID:

1711.01817

BORIS DOI:

10.7892/boris.118886

URI:

https://boris.unibe.ch/id/eprint/118886

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