Abstract
A Landau-type free energy expansion is postulated for a metamagnet possessing two inequivalent magnetic sublattices. Stability analysis of the free energy reveals a number of possible sequences of spontaneous phase transitions which involve various ordered and disordered phases. Moreover, the inter-sublattice exchange coupling is examined as to its role in the associated magnetization processes. It is concluded that relatively small changes in the sublattice magnetization are most likely to occur. These changes are usually accompanied by minor shifts in the critical temperatures. Induced first order transitions to disorder resulting from the inter-sublattice exchange are highly unlikely to take place.
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