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arXiv 1206.5220cond-mat.str-el
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手征晶格绝缘体Cu2OSeO3中Skyrmion晶体的形成和旋转

Formation and rotation of skyrmion crystal in the chiral-lattice insulator Cu2OSeO3

S. Seki, J. -H. Kim, D. S. Inosov, R. Georgii, B. Keimer, S. Ishiwata, Y. Tokura

摘要:

对手征晶格多铁性绝缘体Cu $_2$ OSeO $_3$单晶进行了小角中子散射实验。在没有外磁场的情况下,确定了具有磁调制矢量$q \parallel <001>$的螺旋自旋序。当施加磁场时,三重- $q$磁性结构在刚好低于磁有序温度$T_c$的A相中垂直于场出现,这表明形成了Skyrmions的三角形晶格。值得注意的是,在接近$T_c$时,A相中有利的$q$方向从$q \parallel <110>$变为$q \parallel <001>$。在这两个状态之间的相边界附近,外部磁场诱导Skyrmion晶格的30 $^\circ$旋转。这表明磁各向异性和$T_c$附近的自旋织构之间存在微妙的平衡,即使是很小的扰动也会显著影响skyrmions的有序模式。

英文摘要:

Small angle neutron scattering experiments were performed on a bulk single crystal of chiral-lattice multiferroic insulator Cu$_2$OSeO$_3$. In the absence of an external magnetic field, helical spin order with magnetic modulation vector $q \parallel <001>$ was identified. When a magnetic field is applied, a triple-$q$ magnetic structure emerges normal to the field in the A-phase just below the magnetic ordering temperature $T_c$, which suggests the formation of a triangular lattice of skyrmions. Notably, the favorable $q$-direction in the A-phase changes from $q \parallel <110>$ to $q \parallel <001>$ upon approaching $T_c$. Near the phase boundary between these two states, the external magnetic field induces a 30$^\circ$-rotation of the skyrmion lattice. This suggests a delicate balance between the magnetic anisotropy and the spin texture near $T_c$, such that even a small perturbation significantly affects the ordering pattern of the skyrmions.

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