Abstract
Abstract A phenomenological theory of periodic ferroelectric multilayers, consisting of two alternating ferroelectrics with different transition temperatures, is presented. We consider the case of a ferroelectric phase transition of first order. Interface modes are shown to exist, resulting from the special form of the inhomogeneous polarization profile in the superlattice close below its first order phase transition temperature. The lineshape of the dynamical polarization correlation function has a characteristic temperature dependence, if the damping of the soft mode within each layer constituent is differently strong.
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