论文标题
基于GD的Skyrmion材料中螺旋Q结构的形成机理
Formation mechanism of helical Q structure in Gd-based skyrmion materials
论文作者
论文摘要
使用本地力量方法，我们研究了gdru $ _2 $ si $ _2 $和gd $ _2 $ _2 $ pdsi $ _3 $中的螺旋旋转结构的编队机制。我们计算了顺磁性自旋敏感性，并发现费米表面嵌套不是不稳定的调制的起源，与基于ruderman-kittel-kasuya-yosida机制的天真场景相反。然后，我们将GD旋转之间的交换相互作用分解为每个轨道成分，并表明GD-5 $ d $轨道之间的旋转密度波型相互作用是铁磁性的，但是GD-4 $ F $ F $ ORBITALS之间的相互作用是抗Fiferromagnetic。我们得出的结论是，这两种相互作用的竞争，即轨道间的挫败感，稳定了有限的Q结构。
Using the ab initio local force method, we investigate the formation mechanism of the helical spin structure in GdRu$_2$Si$_2$ and Gd$_2$PdSi$_3$. We calculate the paramagnetic spin susceptibility and find that the Fermi surface nesting is not the origin of the incommensurate modulation, in contrast to the naive scenario based on the Ruderman-Kittel-Kasuya-Yosida mechanism. We then decompose the exchange interactions between the Gd spins into each orbital component, and show that spin-density-wave type interaction between the Gd-5$d$ orbitals is ferromagnetic, but the interaction between the Gd-4$f$ orbitals is antiferromagnetic. We conclude that the competition of these two interactions, namely, the inter-orbital frustration, stabilizes the finite-Q structure.
