Fluctuations and Landau-Devonshire expansion for barium titanate

Details Fluctuations and Landau-Devonshire expansion for barium titanate Fluctuations and Landau-Devonshire expansion for barium titanate

2002-02-20

arxiv.org/abs/cond-mat/0202341v3

Pis'ma v Zh.E.T.F. 75 (2002) 483-487

Physics

Condensed Matter

Statistical Mechanics

Minor changes, 1 reference added, published version

Scientific paper

10.1134/1.1490011

The 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.

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