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Phase diagrams and magnetization curves of the mixed Ashkin–Teller model including metastable and unstable states
The European Physical Journal B ( IF 1.6 ) Pub Date : 2021-07-01 , DOI: 10.1140/epjb/s10051-021-00143-6
J. P. Santos , G. B. B. Nascimento , K. L. A. Resende , R. M. Francisco

Abstract

We investigate the magnetic properties of a mixed Ashkin–Teller model (spin-1/2 and spin-1) in a square lattice, under the effect of a crystal field, using the mean-field theory. Phase diagrams, magnetizations and free energy curves are presented. Besides the stable states of the order parameters, we also obtain the metastable and unstable states, which are shown in the phase diagrams and magnetization curves. The classification of the stable, metastable and unstable states is made by comparing their free-energy values.

Graphic abstract



中文翻译:

包括亚稳态和不稳定状态的混合 Ashkin-Teller 模型的相图和磁化曲线

摘要

我们使用平均场理论研究了方形晶格中混合 Ashkin-Teller 模型(spin-1/2 和 spin-1)在晶体场作用下的磁性。给出了相图、磁化强度和自由能曲线。除了有序参数的稳定状态外,我们还获得了亚稳态和不稳定状态,如相图和磁化曲线所示。稳定、亚稳定和不稳定状态的分类是通过比较它们的自由能值来进行的。

图形摘要

更新日期:2021-07-01
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