Abstract
A recently developed group-theoretic approach to cell-preserving phase transitions in crystals is applied to the case of magnetic transitions. A connection between the magnetic and crystallographic structures of magnetic sublattices is established and illustrated with a description of the cell-preserving magnetic transitions (CPMT) observed in perovskite-type crystals. Next, the theory is applied to CPMT in crystals with the beta -W lattice, with particular reference to the ferromagnetic transition observed in beta -UH3. The admissible ferromagnetic composite structures are found, and the hitherto unexplained magnetisation values observed in this crystal are accounted for on the basis of these structures.
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