| 低温下存在外磁场的一维各向异性海森堡铁磁体的磁性质 |
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| 引用本文： | 林瑞娜,陈渊,王海军,傅梁杰. 低温下存在外磁场的一维各向异性海森堡铁磁体的磁性质[J]. 广州大学学报(自然科学版), 2009, 8(3) |
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| 作者姓名： | 林瑞娜 陈渊 王海军 傅梁杰 |
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| 作者单位： | 广州大学物理与电子工程学院,广东,广州,510006;广州大学物理与电子工程学院,广东,广州,510006;广州大学物理与电子工程学院,广东,广州,510006;广州大学物理与电子工程学院,广东,广州,510006 |
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| 基金项目： | Supported by the National Natural Science Foundation of China (10475021) |
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| 摘 要： | 运用自旋波理论和格林函数方法,研究了在单场有各向异性自旋交换作用的、自旋为S=1/2的一维海森堡铁磁体的磁性质.运用霍斯坦因-普里马可夫变换得到近似哈密顿量.发现在低温区,外磁场和各向异性对关联函数和磁化率产生极大的影响.而在弱磁场的情况下,倒关联长度kx和ky不依赖于温度,并且各向异性对kx相比对ky的影响较弱.所得结果与相应的实验结果和理论值符合得很好.
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| 关 键 词： | 海森堡铁磁体 各向异性 自旋波理论 格林函数方法 |
The low-temperature magnetic properties of the one-dimensional anisotropic Heisenberg ferromagnet in a magnetic field |
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| LIN Rui-na,CHEN Yuan,WANG Hai-jun,FU Liang-jie. The low-temperature magnetic properties of the one-dimensional anisotropic Heisenberg ferromagnet in a magnetic field[J]. Journal og Guangzhou University:Natural Science Edition, 2009, 8(3) |
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| Authors: | LIN Rui-na CHEN Yuan WANG Hai-jun FU Liang-jie |
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| Affiliation: | School of Physics and Electronic Engineering;Guangzhou University;Guangzhou 510006;China |
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| Abstract: | The spin-1/2 quantum Heisenberg ferromagnet with anisotropic spin exchange interactions in one dimension is investigated by means of the Green's function method and the spin-wave theory. In this paper we use the Holstein-Primakoff transformation to get the approximately Hamiltonian. We show that the magnetic field and anisotropy can have a rather drastic effect on the correlation functions and susceptibilities in the low-temperature region. Our results show that inverse correlation lengths kx and ky are ind... |
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| Keywords: | Heisenberg ferromagnet anisotropy spin-wave theory Green' s function method |
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