Abstract
We propose a microscopic model in order to study the multiferroic properties of the triangular compound CuCrO2 taking into account antiferromagnetic interactions in the ab plane, spin-phonon interactions and quadratic magnetoelectric (ME) coupling. The temperature and magnetic field dependence of the polarization P ab and dielectric constant ϵ ab is calculated. P ab increases when h is parallel to its direction and decreases when h is perpendicular to it. We show that ϵ ab has a kink near the magnetic phase transition T N = 24 K which disappears with increasing of an external magnetic field h ab . This behavior is an evidence for a strong ME coupling and in qualitative agreement with the experimental data.
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Apostolov, A.T., Apostolova, I.N., Trimper, S. et al. Dielectric properties of multiferroic CuCrO2 . Eur. Phys. J. B 90, 236 (2017). https://doi.org/10.1140/epjb/e2017-80461-4
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DOI: https://doi.org/10.1140/epjb/e2017-80461-4