J. Phys. IV France 07 (1997) C1-365-C1-366
Ferroelectricity of Europium Manganese Oxide EuMn2O5 with Helimagnetic OrderingH. Nakamura1, M. Ishikawa1, K. Kohn1 and M. Ishikawa2
1 Department of Physics, Waseda University, Shinjuku-ku, Tokyo 169, Japan
2 Institute for Solid State Physics, University of Tokyo, Minato-ku, Tokyo 106, Japan
From the measurements of pyroelectricity, dielectric constant, magnetic susceptibility and specific heat, we conclude that EuMn2O5 is ferroelectric below the Curie temperature TC of 38.6 K. This temperature coincides with the Néel temperature of the helimagnetic ordering of Mn3+ and Mn4+ moments within the accuracy of the measurements. The spontaneous polarization is along the b-direction.
© EDP Sciences 1997