Magnetic and Structural Phase Transitions in Monochalcogenides of Uranium
The theory of simultaneous magnetic and structural first-order transitions in crystals with strong cubic magnetic anisotropy is developed on the basis of a combination of the magnetic modified 8-state Potts model  and theoretical models of structural phase transitions in cubic crystals . The magnetic heat capacity and specific volume, as well as the temperature dependence of the rhombohedron angle, are calculated in a wide temperature range. The calculation of the temperature evolution of high-temperature diffuse magnetic neutron scattering was performed. It was demonstrated that upon passing the Curie point the spectra characteristic of the diffuse scattering are transformed to the magnetic Bragg peaks.
F. A. Kassan-Ogly and B.N. Filippov, "Magnetic and Structural Phase Transitions in Monochalcogenides of Uranium", Solid State Phenomena, Vols. 152-153, pp. 587-590, 2009