Abstract

A previously developed Landau-type free-energy functional of the spin density is used here to investigate the magnetic phase transitions in ${\mathrm{UBr}}_{3}$. The results of this analysis, along with recent neutron-diffraction data, suggest that three successive transitions occur in this hexagonal insulator, in contrast with other studies which conclude that there are only two magnetically ordered phases. Phenomenological features of the magnetic ordering process in common with hexagonal ${\mathrm{CsCoCl}}_{3}$ and tetragonal ${\mathrm{NdBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{6.1}$ are discussed.

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