Magnetic Properties in Ferroelectric Superlattices with Two Alternative Layers Described by a Transverse Spin-1/2 Ising Model

K. Htoutou；A. Oubelkacem；A. Ainane；M. Saber

Chinese Journal of Physics

40卷6期（2002 / 12 / 01）

644 - 656

英文

The critical temperature, magnetization, and subceptibility in ferroelectric superlattices with two 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 Lt layer superlattice of simple cubic symmetry with nearest-neighbor interactions. We derive the phase diagram, the magnetizations profiles, and the susceptibilities. In such superlattices, the critical temperature can shift to either a lower or higher temperature compared with the corresponding bulk value. The superlattice longitudinal susceptibility diverges at the superlattice critical temperature.