论文标题
在有限温度下交换耦合常数
Exchange coupling constants at finite temperature
论文作者
论文摘要
在计算交换耦合参数时，根据KKR（Korringa-Kohn-rostoker）绿色功能方法提出了一种方法来说明热晶格振动的效果，利用合金类比模型。使用多个代表性系统，可以证明，根据材料，热晶格振动的效果可能会对各向同性交换以及各向异性Dzyaloshinskii-Moriya相互作用（DMI）产生重大影响。这反过来又导致了固体磁性特性的温度依赖性的额外贡献，这在一般情况下不能忽略。例如，我们讨论了对各种磁相跃迁的临界温度的影响。特别是，在天空托管材料的情况下，晶格振动对DMI的强烈影响是依赖温度依赖的天空稳定性的附加来源，应考虑到这一点。
An approach to account for the effect of thermal lattice vibrations when calculating exchange coupling parameters is presented on the basis of the KKR (Korringa-Kohn-Rostoker) Green function method making use of the alloy analogy model. Using several representative systems, it is shown that depending on the material the effect of thermal lattice vibrations can have a significant impact on the isotropic exchange as well as anisotropic Dzyaloshinskii-Moriya interactions (DMI). This should lead in turn to an additional contribution to the temperature dependence of the magnetic properties of solids, which cannot be neglected in the general case. As an example, we discuss such an influence on the critical temperature of various magnetic phase transitions. In particular, in the case of skyrmion hosting materials, a strong impact of lattice vibrations on the DMI is an additional source for temperature dependent skyrmion stability which should be taken into consideration.
