论文标题
晶体场中旋转$ 1 $ baxter-wu模型的熵模拟研究
An entropic simulational study of the spin-$1$ Baxter-Wu model in a crystal field
论文作者
论文摘要
我们使用具有状态的关节密度的熵采样模拟在晶体场中研究了二维自旋-1 $ baxter-wu模型的临界行为。我们获得了温度 - 晶体场相图，其中包括一个以挑选点结尾的四出行线。在更改晶体各向异性的同时，使用有限大小的缩放分析，用于获得pentalitaligation点的精确位置。我们的结果将临界温度和晶体场作为$ t_ {pc} = 0.98030（10）$和$ d_ {pc} = 1.68288（62）$。我们还检测到，在相图的一阶区域，特定的热量表现出双峰结构，如Schottky样异常，这与订购级别的跃迁相关。
We investigate the critical behavior of the two-dimensional spin-$1$ Baxter-Wu model in a crystal field using entropic sampling simulations with the joint density of states. We obtain the temperature-crystal field phase diagram, which includes a tetracritical line ending at a pentacritical point. A finite-size scaling analysis of the maximum of the specific heat, while changing the crystal field anisotropy, is used to obtain a precise location of the pentacritical point. Our results give the critical temperature and crystal field as $T_{pc}=0.98030(10)$ and $D_{pc}=1.68288(62)$. We also detect that at the first-order region of the phase diagram, the specific heat exhibits a double peak structure as in the Schottky-like anomaly, which is associated with an order-disorder transition.
