| 零温下在布里渊区边界二维绝缘铁磁体的磁振子软化 |
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| 引用本文： | 成泰民,冮铁臣.零温下在布里渊区边界二维绝缘铁磁体的磁振子软化[J].沈阳化工学院学报,2006,20(1):63-67. |
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| 作者姓名： | 成泰民 冮铁臣 |
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| 作者单位： | 沈阳化工学院数理系,辽宁,沈阳,110142 |
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| 基金项目： | 中国科学院资助项目;高等学校博士学科点专项科研项目 |
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| 摘 要： | 在二维正方绝缘铁磁系统基础上建立一个磁振子-声子相互作用模型．利用格林函数方法研究磁振子-声子相互作用下的二维绝缘铁磁体的磁振子谱，计算布里渊区边界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，并讨论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．
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| 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 |
| 文章编号： | 1004-4639（2006）01-0063-05 |
| 收稿时间： | 2005-11-10 |
| 修稿时间： | 2005-11-10 |
The Magnon-softening of Two Dimensional Insulating Ferromagnet at the Boundary of Brillouin Zone at Absolute Zero Temperature |
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| CHENG Tai-min,GANG Tie-chen.The Magnon-softening of Two Dimensional Insulating Ferromagnet at the Boundary of Brillouin Zone at Absolute Zero Temperature[J].Journal of Shenyang Institute of Chemical Technolgy,2006,20(1):63-67. |
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| Authors: | CHENG Tai-min GANG Tie-chen |
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| Affiliation: | Department of Mathematics and Physics, Shenyang Institute of Chemical Technology, Shenyang 110142, China |
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| Abstract: | A magnon-phonon interaction model is built in two dimensional insulating ferromagnet. By using Matsubara Green function theory, we have studied the magonon spectrum, and calculated the magnon dispersion curve on the main symmetric point and line in the boundary of Brillouin zone for different parameters in the system. It is concluded that at the boundary of Brillouin zone there is a strong broadening in the magnon linewidth and softening. The influences of longitudinal phonon and transverse phonon on the softening and broadening in the magnon linewidth are compared, and the influences of the parameters are also illustrated. |
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| Keywords: | magnon-phonon interaction magnon-softening model ferromagnet broadening in the magnon linewidth |
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