论文标题
MNSC中的Skyrmion晶格的各向异性驱动响应
Anisotropy driven response of skyrmion lattice in MnSc$_2$S$_4$ to applied magnetic fields
论文作者
论文摘要
我们从理论上和实验研究Mn $ _2 $ _2 $ _4 $ _4 $ _4 $ spinel在沿$ [$ 1-10 $] $ crystal方向上应用的磁场下的Mn $ _2 $ _4 $ spinel中的非常规的反铁磁性晶格（AF-SKL）的稳定性。通过对我们在参考文献中提出的最小有效自旋模型进行数值蒙特卡洛模拟。 [S。 Gao等人，Nature 586，37-41（2020）]，我们表明Skyrmion Grattice在同等的和对称$ [$ 1-11 $] $或$ [$ 1-11 $] $平面中对齐，它们同样倾向于应用于应用的磁场。我们将这种行为归因于宿主材料的磁各向异性。中子单晶衍射与有效模型的预测非常良好。它表明，拓扑旋转纹理在低温和中等磁场上不稳定，并由b // $ [$ 1-10 $] $的圆锥阶段取代。本研究阐明了磁各向异性在抗磁性天空状态的稳定中的核心作用。
We theoretically and experimentally study the stability of the unconventional fractional antiferromagnetic skyrmion lattice (AF-SkL) in Mn$_2$S$_4$ spinel under magnetic fields applied along the $[$1-10$]$ crystal direction. By performing numerical Monte Carlo simulations for the minimal effective spin model that we proposed in Ref. [S. Gao, et al., Nature 586, 37-41 (2020)], we show that the skyrmion lattice is aligned within the equivalent and symmetric $[$1-11$]$ or $[$1-11$]$ planes, which are equally inclined to the applied magnetic field. We attribute this behavior to the magnetic anisotropy of the host material. Neutron single crystal diffraction presents a very good agreement with the predictions of the effective model. It reveals that the topological spin texture gets destabilized at low temperatures and moderate magnetic fields and is replaced by a conical phase for B// $[$1-10$]$. The present study elucidates the central role of the magnetic anisotropy in the stabilization of antiferromagnetic skyrmionic states.
