PHASE-DIAGRAM AND MAGNETIZATION MOMENTS OF THE SPIN-5 2 DILUTED ISINGFERROMAGNET IN A TRANSVERSE FIELD/

The phase diagram and the magnetization moments of the spin-5/2 dilute d Ising ferromagnet in a transverse field is studied by an effective f ield method within a single-site cluster theory. The effective field e quations are derived using a probability distribution obtained with th e aid of generalized van der Waerden identities that account for the s ingle-site spin kinematic relations. Correlations between the site dis order and the local configurational-dependent thermal averages of the spin variable are included. The dependence of the transition temperatu re for longitudinal ordering is studied both as a function of the tran sverse field strength and the site dilution. Selected results for the thermal dependence of the longitudinal and transverse components of th e magnetization and their higher moments are also presented.