THEORETICAL-STUDY OF THE QUENCHED DILUTED SPIN-2 ISING FERROMAGNET INA TRANSVERSE FIELD

A theoretical study of the spin 2 Ising ferromagnet with site dilution in a transverse field is presented using an effective field method wi thin the framework of a single site cluster theory. The effective fiel d equations are derived using a probability distribution method based on the use of generalised Van der Waerden identities, that account exa ctly for the single-site kinematic relations. Correlations between the site disorder and the local configurational-dependent thermal average s of the spin variables are included. The dependence of the transition temperature for longitudinal ordering is studied both as a function o f the transverse field strength and the dilution. The thermal dependen ce of the longitudinal and transverse magnetizations, and higher order magnetization moments, are also studied.