标题： 第一性原理研究铁锗中的磁相互作用 显示英文标题

标题： First-principles study of magnetic interactions in FeGe

摘要： 我们理论研究了铁锗的磁性，铁锗是典型的螺旋磁体之一。 为此，我们使用实空间自旋哈密顿量和微磁模型，该模型基于安德森的“局部力定理”推导得出，通过从第一性原理计算得到的自旋极化格林函数来描述低能磁激发。 该模型旨在数值评估倒易空间中的自旋刚度常数，以评估其离域机制的贡献。 计算得到的成对交换相互作用揭示了Ruderman-Kittel-Kasuya-Yoshida耦合在FeGe中的重要性。 因此，所提供的平均场磁相变温度估计与实验测量结果相符，强调了综合实空间/倒易空间方法对于正确描述FeGe中磁激发的必要性。 显示英文摘要

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.