Abstract
An effective field theory that correctly accounts for all the single-site kinematic relations is applied to a study of a quenched site-diluted spin 1 Ising model, containing in addition to the usual bilinear exchange, both biquadratic exchange and single-ion anisotropy. In doing so, particular attention is paid to the approximation made in affecting the configurational averaging. As a by-product, the nature of the configurational averaging adopted by previous authors in studies of the spin 1 2 Ising system is clarified with reference to a single formalism, and the reason for their differing results explained.
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