MAGNETIC-PROPERTIES OF FRUSTRATED ISING FERRIMAGNETS

Equations of state of a frustrated two-sublattice Ising ferrimagnet are derived in the mean-field approximation. The H - T phase diagram is studied. It is pointed out that the intrasublattice frustration strongly affects the reentrant transition temperature T(g)(H). For certain parameters of the model T(g)(H) increases with the field. The influence of frustration on the compensation point is investigated. It is shown that the magnetization of the frustrated ferrimagnetic is continuous at the transition from a ferrimagnetic state to a state of coexistence of ferrimagnetism and spin glass. The temperature dependence of the susceptibility in the ergodic phase is obtained for various degrees of frustration.