Origin of giant dielectric response in ferroelectric thin film multilayers

Abstract

A thermodynamic theory of dielectric response in ferroelectric thin film multilayers is developed. The solution of Lame equation for static dielectric susceptibility has shown that susceptibility diverges at the transition temperature of the thickness induced ferroelectric phase. This divergence is shown to be the origin of the giant dielectric response observed in some multilayers. The theory gives an excellent fit to the temperature dependence of the giant susceptibility observed recently in multilayers of PbTi03-Pb1.~La,Ti03 (x = 0.28).

Pyroelectric Properties of Ferroelectric Superlattice on Transverse Ising Model

“…Much of the theoretical literature makes use of the Landau-Devonshire model, extended in some way to include the interfaces between adjacent layers [5][6][7][8][9]. One problem with this approach is that it is not clear how to account for the coupling between layers within a continuum theory.…”