Multilayer superlattice symmetry

Although the properties of ferroelectric superlattices can be governed by domain structure, no systematic study of this effect has been performed. In other words, the physics of the domain structure formation at the FE phase transition temperature T=Tc in the FE multilayers remains poorly understood. Here we address the question of a phase transition temperature in a periodic superlattice structure consisting of alternate ferroelectric (FE) and paraelectric (PE) layers of nanometric thickness. To get rid of the effect of 90° ferroelastic domains we assume that FE layers have either natural or strain-induced c-oriented uniaxial symmetry. 

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