Abstract
The critical temperature, polarization and dielecric susceptibility in ferroelectric superlattices with three alternative layers described by a transverse spin-1/2 Ising model are studied using the effective field theory with a probability distribution technique. We discuss an L layer superlattice of simple cubic symmetry with nearest-neighbor interactions. We derive the phase diagram, the polarization profiles and the dielectric susceptibilities. In such superlattices, the critical temperature can shift to either lower or higher temperature compared with the corresponding bulk value. The superlattice dielectric longitudinal susceptibility diverges at the superlattice critical temperature.
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