| 含有DM相互作用的混合XXZ模型的临界性质 |
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| 引用本文： | 张修兴,皇甫国庆.含有DM相互作用的混合XXZ模型的临界性质[J].渭南师范学院学报,2007,22(5):35-38. |
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| 作者姓名： | 张修兴 皇甫国庆 |
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| 作者单位： | 渭南师范学院,物理系,陕西,渭南,714000 |
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| 基金项目： | 渭南师范学院校科研和教改项目 |
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| 摘 要： | 利用平均场近似的方法,研究了立方晶格上具有DM相互作用的混合XXZ模型的相变和临界性质.在Ising极限下,在不同的DM相互作用参量D下做出了系统的自发磁化强度m随约化温度T=1/K的变化,得到了系统的临界温度,分析了DM相互作用对系统临界温度的影响;在不同的各向异性参数△下作出了系统二级相变线,结果表明混合自旋XXZ系统只存在二级相变,系统没有出现三临界点.
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| 关 键 词： | 相变 临界温度 量子自旋模型 立方晶格 平均场近似 |
| 文章编号： | 1009-5128（2007）05-0035-04 |
| 修稿时间： | 2007-05-30 |
Critical Behavior of Mixed-Spin XXZ Model with Dzyaloshinsky-Moriya Interaction |
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| ZHANG Xiu-xing,HUANGFU Guo-qing.Critical Behavior of Mixed-Spin XXZ Model with Dzyaloshinsky-Moriya Interaction[J].Journal of Weinan Teachers College,2007,22(5):35-38. |
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| Authors: | ZHANG Xiu-xing HUANGFU Guo-qing |
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| Institution: | Department of Physics, Weinan Teachers University, 714000 Weinan, China |
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| Abstract: | By using the mean-field approximation method,the critical behavior of the mixed-spin XXZ model with DM interaction on the cubic lattice is studied.In the Ising limit,under DM interaction with the parameter D,spontaneous magnetization m in the system changes with the reduced temperature,so critical temperature is got and the effects of DM interaction to critical temperature is analyzed.Besides,under different anisotropic values,the phase diagrams of the second-ordered phase transition are obtained.The results indicate the mixed-spin system XXZ only presents second phase transition and no tricritical point. |
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| Keywords: | phase transition critical temperature quantum spin mode cubic lattice mean-field approximation |
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