Ferrimagnetism of the magnetoelectric compound Cu2OSeO3 probed by Se-77 NMR
Citation:
Belesi M, Rousochatzakis I, Wu HC, Berger H, Shvets IV, Mila F, Ansermet JP, Ferrimagnetism of the magnetoelectric compound Cu2OSeO3 probed by Se-77 NMR, Physical Review B, 82, 9, 2010, 094422-Download Item:
Abstract:
We present a thorough 77Se NMR study of a single crystal of the magnetoelectric compound Cu2OSeO3.
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 of the crystalline symmetry from its high-T cubic P213
space group. These results are in agreement with high resolution x-ray diffraction and magnetization data on
powder samples reported previously by Bos et al. [Phys. Rev. B, 78, 094416 (2008)]. 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 (Jfm ' !50 K) nearest-neighbor exchange interaction.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
Author's Homepage:
http://people.tcd.ie/ivchvetsDescription:
PUBLISHED
Author: SHVETS, IGOR
Type of material:
Journal ArticleCollections
Series/Report no:
Physical Review B82
9
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Full text availableKeywords:
ferrimagnetism, magnetoelectric, Cu2OSeO3, NMRSubject (TCD):
Nanoscience & MaterialsDOI:
http://link.aps.org/doi/10.1103/PhysRevB.82.094422Metadata
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