Exactly solvable model of uniaxial ferroelectrics

Details Exactly solvable model of uniaxial ferroelectrics Exactly solvable model of uniaxial ferroelectrics

2011-05-04

arxiv.org/abs/1105.0930v1

Physics

Condensed Matter

Materials Science

5 pages, 3 figures

Scientific paper

An exactly solvable lattice model with infinite-range potential is applied to uniaxial ferroelectrics. Asymptotically exact expression for free energy as a function of an order parameter at any temperatures is obtained. Effect of thermal expansion of lattice unit cell is taken into account. The free energy expansion in powers of order parameter in the vicinity of critical point is presented. Corrections to Landau expansion are obtained. In particular, it is shown that summand with external field contains a contribution of higher powers over order parameter. Keywords: Lattice model, Free energy, Phase transition, Long-range interatomic potentials, Curie temperature, polarization PACS: 05.20.-y, 05.70.-a, 82.65.+r

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