Magnetic and Structural Phase Transitions in Monochalcogenides of Uranium

Felix A. Kassan-Ogly; B.N. Filippov

doi:10.4028/www.scientific.net/SSP.152-153.587

Paper Titles

Conditions for the Spin-Spiral State in Itinerant Magnets
p.559

A Fluctuating Field Theory for Systems of Localized Magnetic Moments
p.563

Impurity Assisted Interlayer Exchange Coupling in Iron/Silicon Multilayers
p.567

Investigation of the Critical Properties in the 3D Site-Diluted Potts Model
p.571

Investigation of the 3D ANNNI Model by Monte Carlo Methods
p.575

Temperature Hysteresis in the Dynamic Spin-Fluctuation Theory for Strong Ferromagnets
p.579

Charge and Spin Pairing Instabilities in Hubbard Nanoclusters
p.583

Magnetic and Structural Phase Transitions in Monochalcogenides of Uranium
p.587

Application of the Mean-Field Approximation to the Magnetic and Superconducting Phases of Quasi-One-Dimensional Metal
p.591

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Magnetic and Structural Phase Transitions in Monochalcogenides of Uranium

Abstract:

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 [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, 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.