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arXiv 1111.4888cond-mat.stat-mech
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具有三自旋相互作用的自旋1量子Ising系统的热力学性质和phase diagrams

Thermodynamic properties and phase diagrams of spin-1 quantum Ising systems with three-spin interactions

Hui Jiang, Xiang-Mu Kong

摘要:

用平均场方法研究了二维三角晶格上具有三自旋相互作用的自旋1量子伊辛系统。详细研究了序参量和相图的热变化。得到了序参量的稳定、亚稳定和不稳定分支。根据临界点的稳定条件,我们发现系统存在三临界点。在晶场和双二次相互作用下,在适当的晶场和双二次相互作用参数范围内,系统具有丰富的单重入或双重入相变相图。

英文摘要:

The spin-1 quantum Ising systems with three-spin interactions on two-dimensional triangular lattices are studied by mean-field method. The thermal variations of order parameters and phase diagrams are investigated in detail. The stable, metastable and unstable branches of the order parameters are obtained. According to the stable conditions at critical point, we find that the systems exhibit tricritical points. With crystal field and biquadratic interactions, the system has rich phase diagrams with single reentrant or double reentrant phase transitions for appropriate ranges of the both parameters.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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