Magnon relaxation in a spin nematic

被引：13

作者：

Butrim, V. I. ^{[1
]}

Ivanov, B. A. ^{[2
]}

Kuznetsov, A. S. ^{[1
]}

Khymyn, R. S. ^{[3
]}

机构：

[1] VI Vernadsky Tvarichesky Natl Univ, UA-95007 Simferopol, Ukraine

[2] Natl Acad Sci Ukraine, Inst Magnetism, UA-03142 Kiev, Ukraine

[3] TG Schevchenko Kiev Univ, UA-13127 Kiev, Ukraine

来源：

LOW TEMPERATURE PHYSICS | 2008年 / 34卷 / 12期

关键词：

antiferromagnetism; damping; magnetisation; magnons; nematic liquid crystals;

D O I：

10.1063/1.3029753

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Magnon relaxation processes in the nematic phase of a magnet with spin S=1 are investigated for a general form of the isotropic exchange interaction, including bilinear and biquadratic interactions in respect to the site spin operators. The temperature dependence and momentum dependence of the magnetic decrement are found in the long-wavelength approximation. It is shown that the elementary excitations in a spin nematic (magnons) have all the properties of Goldstone excitations; in the limit of small wave vectors they have a linear dispersion law, while the damping is quadratic in the wave vector. The similarity of magnon behavior in a spin nematic to that in an antiferromagnet is noted.

引用

页码：997 / 1004

页数：8

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