Multiferroism in the dielectric function of CuO |
| |
| Authors: | I N Apostolova A T Apostolov S G Bahoosh J M Wesselinowa S Trimper |
| |
| Institution: | 1. University of Forestry, Kl. Ohridsky Blvd. 10, 1756 Sofia, Bulgaria;2. Department of Physics, University of Architecture, Hr. Smirnenski Blvd. 1, 1046 Sofia, Bulgaria;3. Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle, Germany;4. Department of Physics, University of Sofia, Blvd. J. Bouchier 5, 1164 Sofia, Bulgaria;5. Institute of Physics, Martin‐Luther‐University, Von‐Seckendorff‐Platz 1, 06120 Halle, Germany |
| |
| Abstract: | The multiferroic properties of bulk CuO are manifested in the dielectric function which can be triggered by an external magnetic field h and by the temperature T. Within a microscopic model and a Green's function technique we have calculated the dielectric function \varepsilon ({\bf k};T,h). At the magnetic phase transition temperature T_{{\rm N}2} the dielectric function offers a pronounced anomaly. This kink disappears when the magnetic field is enhanced and \varepsilon ({\bf k};T,h) decreases with increasing h ‐field. Both properties are indications for a strong magnetoelectric coupling in this material. The observation of multiferroism in CuO within an analytical approach is achieved by considering frustration and a linear magnetoelectric coupling. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) |
| |
| Keywords: | multiferroics dielectric function magnetic fields CuO |
|
|
