HYDRODYNAMIC THEORY OF SPIN-WAVES IN SPIN-GLASSES AND OTHER SYSTEMS WITH NONCOLLINEAR SPIN ORIENTATIONS
HYDRODYNAMIC THEORY OF SPIN-WAVES IN SPIN-GLASSES AND OTHER SYSTEMS WITH NONCOLLINEAR SPIN ORIENTATIONS
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DOI：
10.1103/physrevb.16.2154
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发表时间：
1977-01-01
影响因子：
3.7
通讯作者：
SASLOW, WM
中科院分区：
文献类型：
--
作者：
HALPERIN, BI;SASLOW, WM
自旋波的流体力学理论被扩展到磁性系统，例如自旋玻璃或具有螺旋自旋序的晶体，其中在不同位置上存在平衡磁化，自旋方向不共线。如果总磁化强度为零，并且假设相互作用在自旋空间中是各向同性的，则可以预测在小波矢量k→处定义良好的自旋波，具有线性色散关系，并且对于每个k→值有三种极化。然而，对于自旋玻璃，有限自旋刚度常数的流体动力学假设可能是有问题的。非零磁化进行了简要讨论。
The hydrodynamic theory of spin waves is extended to a magnetic system such as a spin glass or a crystal with helical spin order, in which there are equilibrium magnetizations on different sites, with spin directions that are not collinear. If the total magnetization is zero and if the interactions are assumed to be isotropic in spin space, one predicts well-defined spin waves at small wave vectors k→, with a linear dispersion relation, and three polarizations for each value of k→. The hydrodynamic assumption of a finite spin-stiffness constant may be questionable, however, for the spin glass. Nonzero magnetization is discussed briefly.