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29 March 2024
 
  » arxiv » cond-mat/0202341

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Fluctuations and Landau-Devonshire expansion for barium titanate
A. I. Sokolov ; A. K. Tagantsev ;
Date 20 Feb 2002
Journal Pis’ma v Zh.E.T.F. 75 (2002) 483-487
Subject Statistical Mechanics; Materials Science | cond-mat.stat-mech cond-mat.mtrl-sci
AbstractThe experimentally observed temperature dependence of the quartic coefficients in the Landau-Devonshire expansion for BaTiO_3 is naturally accounted for within a proper fluctuation model. It is explained, in particular, why one of the quartic coefficients varies with temperature above T_c while the second is constant. The tetragonal phase in BaTiO_3 is argued to exist essentially due to the thermal fluctuations, while the true Landau-Devonshire expansion with temperature-independent coefficients favours the rhombohedral ferroelectric phase. Certain conclusions concerning the temperature dependence of the sextic Landau-Devonshire coefficients are also made.
Source arXiv, cond-mat/0202341
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