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Ferrimagnetism of the magnetoelectric compound Cu2OSeO3 probed by 77Se NMR
journal contribution
posted on 2018-08-09, 08:41 authored by M. Belesi, Ioannis RousochatzakisIoannis Rousochatzakis, H.C. Wu, H. Berger, I.V. Shvets, Frederic Mila, J.P. AnsermetWe 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 PhysicsVolume
82Issue
9Citation
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
2010Notes
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.82.094422ISSN
1098-0121eISSN
1550-235XPublisher version
Language
- en