We investigate the ferroelectric phase transition and domain formation in aperiodic superlattice consisting of alternate ferroelectric (FE) andparaelectric (PE) layers of nanometric thickness. We find that the polarizationdomains formed in the different FE layers can interact with each other via thePE layers. By coupling the electrostatic equations with those obtained byminimizing the Ginzburg-Landau functional we calculate the critical temperatureof transition Tc as a function of the FE/PE superlattice wavelength andquantitatively explain the recent experimental observation of a thicknessdependence of the ferroelectric transition temperature in KTaO3/KNbO3strained-layer superlattices.
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