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arXiv 1803.09415cond-mat.str-elcond-mat.mtrl-sciphysics.comp-ph
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FeGe中磁相互作用的第一性原理研究

First-principles study of magnetic interactions in FeGe

Ilya V. Kashin, Sergey N. Andreev, Vladimir V. Mazurenko

摘要:

我们从理论上研究了铁锗的磁性,铁锗被称为一个典型的helimagnets。为此,我们使用的实空间自旋哈密顿量和微磁模型,根据安德森的“局部力定理”,通过自旋极化的格林函数,从第一性原理计算得到的描述低位磁激发。该模型的目的是数值计算自旋刚度常数在倒易空间,以评估的巡回机制。计算的两两交换相互作用揭示了Ruderman-Kittel-Kasuya-Yoshida耦合在FeGe中的重要性。因此,提供的平均场估计的磁转变温度与实验测量结果一致,强调了全面的真实/倒易空间为基础的方法,在FeGe的磁激发的适当描述的必要性。

英文摘要:

We theoretically study the magnetic properties of iron germanium, known as one of canonical helimagnets. For this purpose we use the real-space spin Hamiltonian and micromagnetic model, derived in terms of Andersen's "local force theorem", to describe the low-lying magnetic excitations via spin-polarized Green's function, obtained from the first-principles calculations. The model was designed to numerically evaluate the spin stiffness constant in reciprocal space, in order for assessment of the contributing itinerant mechanisms. The calculated pairwise exchange interactions reveal the essentiality of Ruderman-Kittel-Kasuya-Yoshida coupling in FeGe. Thus provided mean-field estimation of magnetic transition temperature agrees good with the experimental measurement, underlining the necessity of the comprehensive real/reciprocal space-based approach for a proper description of magnetic excitations in FeGe.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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