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

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  • Angel T. Apostolov
  • Iliana N. Apostolova
  • Julia M. Wesselinowa

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

Suggested Citation

  • Angel T. Apostolov & Iliana N. Apostolova & Julia M. Wesselinowa, 2015. "Theory of magnetic field control on polarization in multiferroic RCrO 3 compounds," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 88(12), pages 1-9, December.
    • Handle: RePEc:spr:eurphb:v:88:y:2015:i:12:p:1-9:10.1140/epjb/e2015-60649-4
    DOI: 10.1140/epjb/e2015-60649-4
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    Solid State and Materials;

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