Magnetoelectric coupling in the cubic ferrimagnet Cu2OSeO3

Jan-Willem G. Bos, Claire V. Colin, Thomas T. M. Palstra

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Abstract

We have investigated the magnetoelectric coupling in the lone pair containing piezoelectric ferrimagnet Cu2OSeO3. Significant magnetocapacitance develops in the magnetically ordered state (T-c = 60 K). We find critical behavior near T-c 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.

Original languageEnglish
Article number094416
Pages (from-to)-
Number of pages7
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume78
Issue number9
DOIs
Publication statusPublished - Sep 2008

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