Dielectric properties of multiferroic CuCrO2

Angel T. Apostolov, Illiana N. Apostolova, Steffen Trimper and Julia M. Wesselinowa ()
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Angel T. Apostolov: University of Architecture, Civil Engineering and Geodesy, Department of Physics
Illiana N. Apostolova: University of Forestry, Faculty of Forest Industry
Steffen Trimper: Martin-Luther-University, Institute of Physics
Julia M. Wesselinowa: University of Sofia, Department of Physics

The European Physical Journal B: Condensed Matter and Complex Systems, 2017, vol. 90, issue 12, 1-6

Abstract: 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.

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1140/epjb/e2017-80461-4

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