Abstract
Using the Monte Carlo method we investigate the phase transitions and thermodynamic properties of magnetic structures with noncollinear directions of magnetic moments corresponded to antiferromagnetic q=4 Potts model on a face-centered cubic lattice. Monte Carlo simulations are performed on lattices with linear sizes L=20÷44. Thermodynamic parameters: the order parameter mAF, susceptibility χ, internal energy U, and specific heat C are evaluated for all studied systems. By employing the fourth order Binder cumulant method, a first order transition is shown to be occurred in the model.
Highlights
There exists at present a rich body of the experimental material on magnetic substances with crystalline structure and properties of AnX-type compounds with the NaCl structure
Multi-k structures with wave vectors comprised more than one component (2-k structures for two-component wave vector and 3-k structures for three-component vector) were proposed
The interpretation of USb neuronography is in a better agreement with experimental data of a 3-k structure than a collinear model
Summary
There exists at present a rich body of the experimental material on magnetic substances with crystalline structure and properties of AnX-type compounds with the NaCl structure. The interpretation of USb neuronography is in a better agreement with experimental data of a 3-k structure than a collinear model. The investigation of phase transitions (PTs) and thermodynamic properties of the 4-state antiferromagnetic (AF) Potts model is the main goal of this study.
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