论文标题
Skyrmion Lattices的Fermi-Surface起源于中心对称稀有地层的金属间
Fermi-surface origin of skyrmion lattices in centrosymmetric rare-earth intermetallics
论文作者
论文摘要
We show from first-principles that barrel-shaped structures within the Fermi surface of the centrosymmetric intermetallic compounds GdRu$_2$Si$_2$ and Gd$_2$PdSi$_3$ give rise to Fermi surface nesting, which determines the strength and sign of quasi-two-dimensional Ruderman-Kittel-Kasuya-Yosida pairwise exchange interactions between the GD时刻。这是导致其螺旋单$ q $旋转基态基态的主要机制，它提供了过渡温度和与实验一致的磁性周期。使用原子自旋动力模拟，我们在实验中观察到的gdru $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $的平方skyrmion晶格的稳定在三维费米表面拓扑之间的微妙界限。
We show from first-principles that barrel-shaped structures within the Fermi surface of the centrosymmetric intermetallic compounds GdRu$_2$Si$_2$ and Gd$_2$PdSi$_3$ give rise to Fermi surface nesting, which determines the strength and sign of quasi-two-dimensional Ruderman-Kittel-Kasuya-Yosida pairwise exchange interactions between the Gd moments. This is the principal mechanism leading to their helical single-$q$ spin-spiral ground states, providing transition temperatures and magnetic periods in good agreement with experiment. Using atomistic spin-dynamic simulations, we draw a direct line between the subtleties of the three-dimensional Fermi surface topology and the stabilization of a square skyrmion lattice in GdRu$_2$Si$_2$ at applied magnetic fields as observed in experiment.
