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Title: Phase transition studies of BiMnO{sub 3}: Mean field theory approximations

We studied the phase transition and magneto-electric coupling effect of BiMnO{sub 3} by employing mean field theory approximations. To capture the ferromagnetic and ferroelectric transitions of BiMnO{sub 3}, we construct an extended Ising model in a 2D square lattice, wherein, the magnetic (electric) interactions are described in terms of the direct interactions between the localized magnetic (electric dipole) moments of Mn ions with their nearest neighbors. To evaluate our model, we obtain magnetization, magnetic susceptibility and electric polarization using mean field approximation calculations. Our results reproduce both the ferromagnetic and the ferroelectric transitions, matching very well with the experimental reports. Furthermore, consistent with experimental observations, our mean field results suggest that there is indeed a coupling between the magnetic and electric ordering in BiMnO{sub 3}.
Authors:
;  [1]
  1. Department of Physics, National Institute of Technology, Tiruchirapalli-620015 (India)
Publication Date:
OSTI Identifier:
22490181
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1665; Journal Issue: 1; Conference: 59. DAE solid state physics symposium 2014, Tamilnadu (India), 16-20 Dec 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; APPROXIMATIONS; BISMUTH COMPOUNDS; COUPLING; ELECTRIC DIPOLE MOMENTS; FERROELECTRIC MATERIALS; FERROMAGNETIC MATERIALS; FERROMAGNETISM; ISING MODEL; MAGNETIC SUSCEPTIBILITY; MAGNETIZATION; MANGANATES; MANGANESE IONS; MEAN-FIELD THEORY; PHASE TRANSFORMATIONS; POLARIZATION; TETRAGONAL LATTICES