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零温下在Λ线三角绝缘铁磁体的磁振子软化

Softening of magnon of two-dimensional triangular insulating ferromagnet on the Λ line at 0K
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摘要 在二维绝缘铁磁系统基础上建立了一个磁振子-声子相互作用模型.利用Matsubara格林函数方法研究了磁振子-声子相互作用下的三角绝缘铁磁体的磁振子谱,计算了布里渊区的主要对称点线上的磁振子色散曲线.发现在布里渊区边界区域磁振子谱的软化和磁振子谱线增宽最明显.比较了纵向声子与横向声子对磁振子谱的软化与磁振子谱线增宽的影响,也讨论了各项参数的变化对磁振子谱的软化与磁振子谱线增宽的影响. A magnon-phonon interaction model was built in two-dimensional triangular insulating ferromagnet. By using Matsubara Green function theory, we studied the magonon spectrum, and calculated the magnon dispersion curve on the A line in the Brillouin Zone for different prameters in the system. It is concluded that at the boundary of Brillouin Zone there is a strong broadening in the magnon linewidth and softening of the magonon spectrum.The influences of longitudinal phonon and transverse phonon on the softening of the magonon spectrum and broadening in the magnon linewidth were compared. Influences of the parameters on the afore-mentioned softening and broadening phenomena were also illustrated.
作者 成泰民 鲜于泽 杜安
机构地区 东北大学理学院
出处 《沈阳工业大学学报》 EI CAS 2005年第4期470-473,共4页 Journal of Shenyang University of Technology
基金 国家自然科学基金资助项目(59471020) 高等学校博士学科点基金资助项目(98014513)
关键词 磁振子-声子相互作用 磁振子软化 铁磁体 磁振子谱线增宽 格林函效方法 magnon-phonon interaction softening of magnon mode ferromagnet broadening in magnon linewidth green function theory
分类号 O482.523 [理学—固体物理] O482.5 [理学—固体物理]
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参考文献13

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沈阳工业大学学报
2005年 第4期

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