| 各向异性Heisenberg反铁磁体的格林函数方法 |
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| 引用本文： | 杜安,魏国柱.各向异性Heisenberg反铁磁体的格林函数方法[J].东北大学学报(自然科学版),1993(2). |
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| 作者姓名： | 杜安 魏国柱 |
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| 作者单位： | 东北工学院物理系
(杜安)，东北工学院物理系(魏国柱) |
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| 摘 要： | 利用双时格林函数方法讨论了层间耦合作用对自旋1/2层状反铁磁体磁学性质的影响。低温下,定义了一个反映体系结构特点的特征温度,给出了两个低温区内和接近Neel温度时磁化强度和平行磁化率的渐近表达式,也给出了弱的层间耦合下Neel温度的渐近表达式。表明了层间耦合作用对建立反铁磁长程序是必不可少的。
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| 关 键 词： | Heisenberg模型 层间耦合 特征温度 Neel温度 |
Green Function Method for Anisotropic Heisenberg Antiferromagnets |
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| Du An,Wei Guozhu.Green Function Method for Anisotropic Heisenberg Antiferromagnets[J].Journal of Northeastern University(Natural Science),1993(2). |
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| Authors: | Du An Wei Guozhu |
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| Abstract: | The effect of interlayet coupling on the magnetic properties of layered antiferromagnets with spin 1/2 is discussed. A characteristic temperature reflecting the structural feature of a system is defined at low temperature with asymptotic expressions given to the magnetization and parallel susceptiblity with two low-temperature regions and/or a region approaching to Neel temperature. Also, an asymptotic expression is given to Neel temperature under weak interlayer coupling effect. It is shown that the interlayer coupling effect is indispensable to the establishment of a long-range antiferromagnetic order. |
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| Keywords: | Heisenbetg model inter laver coupling characteristic temperature Neel temperature |
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