Low-Energy Structure of Heisenberg Ferrimagnetic Spin Chains
Low-Energy Structure of Heisenberg Ferrimagnetic Spin Chains
复制标题
海森堡亚铁磁自旋链的低能结构
DOI：
10.1143/jpsj.67.3711
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发表时间：
1998
影响因子：
1.7
通讯作者：
T. Sakai
中科院分区：
文献类型：
--
作者：
Shoji Yamamoto;T. Sakai
数值研究了海森堡亚铁磁自旋链的静态和动态结构因子。元激发存在两个不同的分支，表现出铁磁和反铁磁方面。铁磁性特征随着温度的升高而逐渐消失，而反铁磁性特征在更高的温度下仍然存在。在铁磁和反铁磁谱的下边界处，散射强度非常大。所有这些观察结果都与最近报道的热行为中的铁磁-反铁磁交叉相一致。
Static and dynamic structure factors of Heisenberg ferrimagnetic spin chains are numerically investigated. There exist two distinct branches of elementary excitations, which exhibit ferromagnetic and antiferromagnetic aspects. The ferromagnetic feature is smeared out with the increase of temperature, whereas the antiferromagnetic one persists up to higher temperatures. The scattering intensity is remarkably large at lower boundaries of the ferromagnetic and antiferromagnetic spectra. All these observations are consistent with the ferromagnetic-to-antiferromagnetic crossover in the thermal behavior which has recently been reported.