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

刘婷玉 ¹赵薇 ¹王涛 ¹安小冬 ¹卫来 ¹黄以能²

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作者信息

1. Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matters,College of Physical Science and Technology,Yili Normal University,Yili 835000,China
2. Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matters,College of Physical Science and Technology,Yili Normal University,Yili 835000,China;National Laboratory of Solid State Microstructures,School of Physics,Nanjing University,Nanjing 210008,China
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Abstract

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.

Key words

phase transition/molecular field theory/Ising model/Monte Carlo

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基金项目

Open Project of the Key Laboratory of Xinjiang Uygur Autonomous Region,China(2021D04015)

Yili Kazakh Autonomous Prefecture Science and Technology Program Project,China(YZ2022B021)

出版年

2024

中国物理B(英文版)

中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI

影响因子：0.995

ISSN：1674-1056

参考文献量45

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