Phase diagrams of a spin-1 Ising superlattice with alternating transverse field

The effects of alternating transverse fields Omega(a) and Omega(b) on the critical behavior of an alternating spin-1 Ising superlattice are studied within an effective field theory with a probability distribution technique that accounts for the single-site spin correlation. Critical temperatures are calculated as a function of the thickness of the superlattice and the strength of the transverse field. Depending on the values of the transverse fields Omega(a) and Omega(b), the critical temperature can increase or decrease with increasing the thickness of the film, such result is not obtained in the uniform transverse field case (Omega(a) = Omega(b)). Furthermore, for each thickness L of the film, a long range ordered phase persist at low temperature for selected values of the transverse field Omega(a) and arbitrary values of Omega(b). The effects of interlayer and intralayer exchange interactions are also examined.