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Bulgarian Journal of Physics
Print: 1310-0157 Online: 1314-2666
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RECOGNIZED BY THE EUROPEAN PHYSICAL SOCIETY 
Bulg. J. Phys. vol.38 no.4 (2011), pp. 420-425
Critical Exponents of Multiferroic Hexagonal RMnO3
J.M. Wesselinowa1, A.T. Apostolov2, I.N. Apostolova2, S.G. Bahoosh3
1University of Sofia, Faculty of Physics, Blvd. J. Bouchier 5, 1164 Sofia, Bulgaria
2Faculty of Forest Industry, University of Forestry, Blvd. Kl. Ohridsky 10, 1756 Sofia, Bulgaria
3Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle, Germany
go back1University of Sofia, Faculty of Physics, Blvd. J. Bouchier 5, 1164 Sofia, Bulgaria
2Faculty of Forest Industry, University of Forestry, Blvd. Kl. Ohridsky 10, 1756 Sofia, Bulgaria
3Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle, Germany
Abstract. A microscopic model and a Green's function technique are developed to study the critical behavior of some multiferroics such as hexagonal RMnO3. The temperature dependence and the external field dependence of the order parameter for the magnetization are determined. The critical exponents β and δ are calculated. Applying the scaling laws γ, α and ν are also obtained. The critical exponents are in very good agreement with the existing experimental data.