Abstract
The critical properties of the magnetic spin-1/2 Ising film are studied using the effective field theory with a probability distribution technique that accounts for the self-spin correlation functions. We discuss an L-layer film of simple cubic symmetry with nearest-neighbour interactions in which the strength of the interaction at the surface is different from the bulk value. We derive the phase diagram, the longitudinal susceptibility and the effective critical exponents in the case of a perfect surface. In such films, the critical temperature can shift to either lower or higher temperature compared to the corresponding bulk value.
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