Phase diagrams and magnetic properties of the frustrated metamagnets have been studied. We have shown that strong disorder can narrow the temperature and the magnetic-field interval where the metamagnetic transition takes place. With increasing disorder this discontinuous transition disappears transforming into the second-order phase transition. The magnetic field usually widens the region of the (H, T) phase diagram where the antiferromagnetic nonergodic state exists. The de Almeida-Thouless line has a jump when crossing the metamagnetic phase transition line which results in discontinuous transition into the nonergodic state.
Magnetic properties of disordered Ising antiferromagnets with frustrated intra-sublattice exchange interactions are studied. The theory explains satisfactorily some experimental results.
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