Magnetoelectric coupling in the cubic ferrimagnet Cu2OSeO3

Details Magnetoelectric coupling in the cubic ferrimagnet Cu2OSeO3 Magnetoelectric coupling in the cubic ferrimagnet Cu2OSeO3

2008-08-28

arxiv.org/abs/0808.3955v1

Phys. Rev. B 78, 094416 (2008)

Physics

Condensed Matter

Materials Science

accepted for publication in PRB

Scientific paper

10.1103/PhysRevB.78.094416

We have investigated the magnetoelectric coupling in the lone pair containing piezoelectric ferrimagnet Cu2OSeO3. Significant magnetocapacitance develops in the magnetically ordered state (TC = 60 K). We find critical behavior near TC and a divergence near the metamagnetic transition at 500 Oe. High-resolution X-ray and neutron powder diffraction measurements show that Cu2OSeO3 is metrically cubic down to 10 K but that the ferrimagnetic ordering reduces the symmetry to rhombohedral R3. The metric cubic lattice dimensions exclude a magnetoelectric coupling mechanism involving spontaneous lattice strain, and this is unique among magnetoelectric and multiferroic materials.

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