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- W2090945338 abstract "General features of the order parameter distribution in barium titanate in its paraelectric phase and in its ferroelectric phases (tetragonal and orthorhombic) are presented. The density of probability of the polarization [Formula: see text], defined by an average of the local order parameters over regions of various sizes and shapes (L(x) × L(y) × L(z)), is examined by molecular dynamics simulations using a first-principles derived effective Hamiltonian. The free energies [Formula: see text] associated with these probabilities are computed by thermodynamic integration. The evolution of these quantities are explained through the computation of pair correlations, which are found, as stated in several previous works, very anisotropic, 'needle-like', with longitudinal correlations ([Formula: see text]) having much longer range than transverse ones ([Formula: see text]). The correlations explain why the density of probability of the order parameter evolves from a multiple-peaked distribution with maxima along [111] (in the single cell), along [100] for small needle-like regions, towards a single-peaked distribution for larger regions. A useful expression in which the shape-dependence of the free energy is manifest is provided." @default.
- W2090945338 created "2016-06-24" @default.
- W2090945338 creator A5072295244 @default.
- W2090945338 date "2011-03-09" @default.
- W2090945338 modified "2023-09-25" @default.
- W2090945338 title "Correlations and local order parameter in the paraelectric phase of barium titanate" @default.
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- W2090945338 doi "https://doi.org/10.1088/0953-8984/23/12/125901" @default.
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