Abstract
A model of simultaneous magnetic and structural first-order transitions in crystals with strong cubic magnetic anisotropy has been constructed on the basis of a combination of the magnetic modified 8-state Potts model [1] and theoretical models of structural phase transitions in cubic crystals [2]. The magnetic heat capacity and specific volume, as well as the temperature dependence of the rhombohedron angle, have been calculated in a wide temperature range. The calculation of the temperature evolution of high-temperature diffuse magnetic neutron scattering has been performed to show that upon the passage through the Curie point it is converted into magnetic Bragg peaks.
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