Phase diagram and tricritical behavior of an Ising metamagnet model in a trimodal random field

Abstract: The phase diagram of an Ising metamagnet in a random magnetic field is studied by using mean-field equations from Bogoliubov''s variational principle. The trimodal probability distribution is applied. The phase diagram in the plane presents continuous and first-order transition lines. The phase transition lines, together with the critical points, were obtained for several random field values. [Copyright &y& Elsevier]