Unconventional phase diagrams in an ultra-thin spin-1 Ising film with site (or bond) dilution at the surfaces

The phase diagrams of two nanoscaled thin films with bond and site dilutions at the surfaces, described by the spin-1 Ising model with single-ion anisotropy (D), are investigated by the use of the effective field theory with correlations. They are consisted of two layers. A number of characteristic phenomena have been found in the behaviors of transition temperature and tricritical point, which are heavily dependent on the ratios (r = J(1)/J and d = D/J) and a concentration (p) of bond or site dilution at the surfaces, where J is the exchange interaction in inner layer and J(1) is the exchange interaction between the surface. (C) 2014 Elsevier B.V. All rights reserved.