Phase transition properties of a ferroelectric spin-1/2 Ising superlattice

The phase transition properties of a ferroelectric superlattice described by the Ising model in a transverse field have been investigated using the effective-field theory with a probability distribution technique that accounts for the self-spin correlation functions. An independent interface plane has been assumed and the parameters that imitate BaTiO3/SrTiO3 structure have been used in our calculation. The Curie temperature, polarization, and dielectric constant have been obtained. The most striking feature is that the dielectric constant presents a maximum at room temperature. This kind of feature has been observed in a recent experimental measurement.