Theory of magnetic field control on polarization in multiferroic RCrO 3 compounds

Angel T. Apostolov, Iliana N. Apostolova and Julia M. Wesselinowa ()

The European Physical Journal B: Condensed Matter and Complex Systems, 2015, vol. 88, issue 12, 1-9

Abstract: A microscopic mechanism to describe the magnetic field H dependence of the polarization P is proposed on the basis of a microscopic model for RCrO 3 including the spin-phonon interaction. Using the Green’s function theory in Peierls systems we have studied the two contributions to P due to the antisymmetric exchange Dzyaloshinskii-Moriya interaction P AS and the magnetostriction P MS . The behaviour of P(H) – increase or decrease – in different multiferroics can be explained in our model taking into account the second order spin-phonon interaction constants. When a magnetic field is applied to a magnetoelectric material, the material is strained. H changes the average of the spin operator products and so P. Moreover, H renormalizes the elastic constant which explains the strain effect. From here we have found a qualitative relationship between pressure and magnetic field effects on P. The observed results are in good qualitatively agreement with the experimental data. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2015

Keywords: Solid State and Materials (search for similar items in EconPapers)
Date: 2015
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DOI: 10.1140/epjb/e2015-60649-4

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