An entropic simulational study of the spin-$1$ Baxter-Wu model in a crystal field
| Autor: | Cláudio J. DaSilva, A. A. Caparica, Paulo H. L. Martins, L. S. Ferreira, L.N. Jorge |
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| Rok vydání: | 2020 |
| Předmět: |
Statistics and Probability
Physics Condensed matter physics Field (physics) Statistical Mechanics (cond-mat.stat-mech) FOS: Physical sciences Statistical and Nonlinear Physics 01 natural sciences 010305 fluids & plasmas Crystal 0103 physical sciences Density of states Anomaly (physics) 010306 general physics Anisotropy Scaling Condensed Matter - Statistical Mechanics Phase diagram Spin-½ |
| DOI: | 10.48550/arxiv.2008.13037 |
| Popis: | 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. Comment: 7 pages. 7 figures |
| Databáze: | OpenAIRE |
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