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(英文)  

The low-temperature magnetic properties of the one-dimensional anisotropic Heisenberg ferromagnet in a magnetic field

作　　者：林瑞娜[1] 陈渊[1] 王海军[1] 傅梁杰[1] 

机构地区：[1]广州大学物理与电子工程学院,广东广州510006

出　　处：《广州大学学报（自然科学版）》2009年第3期31-36,共6页Journal of Guangzhou University:Natural Science Edition

基　　金：Supported by the National Natural Science Foundation of China (10475021)

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.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...

关 键 词：海森堡铁磁体 各向异性 自旋波理论 格林函数方法 

分 类 号：O482.525[理学—固体物理]