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Ferrimagnetism of the magnetoelectric compound Cu2OSeO3 probed by 77Se NMR

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posted on 09.08.2018 by M. Belesi, Ioannis Rousochatzakis, H.C. Wu, H. Berger, I.V. Shvets, Frederic Mila, J.P. Ansermet
We present a thorough 77Se nuclear-magnetic-resonance (NMR) study of a single crystal of the magnetoelectric compound Cu 2OSeO3. The temperature dependence of the local electronic moments extracted from the NMR data is fully consistent with a magnetic phase transition from the high- T paramagnetic phase to a low- T ferrimagnetic state with 3/4 of the Cu2+ ions aligned parallel and 1/4 aligned antiparallel to the applied field of 14.09 T. The transition to this 3up-1down magnetic state is not accompanied by any splitting of the NMR lines or any abrupt modification in their broadening, hence there is no observable reduction in the crystal symmetry from its high- T cubic P 213 space group. These results are in agreement with high-resolution x-ray diffraction and magnetization data on powder samples reported previously by Bos [Phys. Rev. B 78, 094416 (2008)]10.1103/PhysRevB.78.094416. We also develop a mean-field theory description of the problem based on a microscopic spin Hamiltonian with one antiferromagnetic (Jafm ≃68 K) and one ferromagnetic (J fm ≃-50 K) nearest-neighbor exchange interaction. © 2010 The American Physical Society.

Funding

H. B. acknowledges financial support from the Swiss NSF and by the NCCR MaNEP.

History

School

  • Science

Department

  • Physics

Published in

Physical Review B - Condensed Matter and Materials Physics

Volume

82

Issue

9

Citation

BELESI, M. ... et al., 2010. Ferrimagnetism of the magnetoelectric compound Cu2OSeO3 probed by 77Se NMR. Physical Review B - Condensed Matter and Materials Physics, 82: 094422.

Publisher

© American Physical Society (APS)

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2010

Notes

This paper was accepted for publication in the journal Physical Review B - Condensed Matter and Materials Physics and the definitive published version is available at https://doi.org/10.1103/PhysRevB.82.094422

ISSN

1098-0121

eISSN

1550-235X

Language

en

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