Comparative study on phase transition behaviors of fractional molecular field theory and random-site Ising model

Fractional molecular field theory (FMFT) is a phenomenological theory that describes phase transitions in crystals with randomly distributed components, such as the relaxor-ferroelectrics and spin glasses. In order to verify the feasibility of this theory, this paper fits it to the Monte Carlo simul...

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Bibliographic Details
Published in:Chinese physics B 2024-03, Vol.33 (3), p.36403
Main Authors: Liu, Ting-Yu, Zhao, Wei, Wang, Tao, An, Xiao-Dong, Wei, Lai, Huang, Yi-Neng
Format: Article
Language:English
Subjects:
Ising model
molecular field theory
Monte Carlo
phase transition
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Summary:Fractional molecular field theory (FMFT) is a phenomenological theory that describes phase transitions in crystals with randomly distributed components, such as the relaxor-ferroelectrics and spin glasses. In order to verify the feasibility of this theory, this paper fits it to the Monte Carlo simulations of specific heat and susceptibility versus temperature of two-dimensional (2D) random-site Ising model (2D-RSIM). The results indicate that the FMFT deviates from the 2D-RSIM significantly. The main reason for the deviation is that the 2D-RSIM is a typical system of component random distribution, where the real order parameter is spatially heterogeneous and has no symmetry of space translation, but the basic assumption of FMFT means that the parameter is spatially uniform and has symmetry of space translation.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/ad0cc7