论文标题
化学替换对Cu $ _2 $ OSEO $ _3 $的Skyrmion阶段的影响
Effect of chemical substitution on the skyrmion phase in Cu$_2$OSeO$_3$
论文作者
论文摘要
由于其拓扑保护造成的独特品质，磁性天际一直是激烈研究的重点。以前关于Cu $ _2 $ OSEO $ _3 $的工作是唯一已知的绝缘多性Skyrmion材料，它表明化学替代品会改变Skyrmion阶段。我们将Zn，ag和s替代粉末状Cu $ _2 $ oseo $ _3 $来研究磁相图的影响。在AG和S取代中，我们发现，通过磁力测定法和小角度的中子散射（SANS）确定，天空相位在较大的温度范围内稳定。同时，虽然先前的磁化表征表明在Zn取代的样品中两个高温空中阶段，但SANS揭示了高温相为Skyrmionic，而我们无法将另一个与螺旋顺序区分开。总体而言，从$ | $ q $ |的中子散射推断出的化学替代削弱了螺旋和天空序列。 \ $ 0.01 $Å^{ - 1} $磁峰。
Magnetic skyrmions have been the focus of intense research due to their unique qualities which result from their topological protections. Previous work on Cu$_2$OSeO$_3$, the only known insulating multiferroic skyrmion material, has shown that chemical substitution alters the skyrmion phase. We chemically substitute Zn, Ag, and S into powdered Cu$_2$OSeO$_3$ to study the effect on the magnetic phase diagram. In both the Ag and the S substitutions, we find that the skyrmion phase is stabilized over a larger temperature range, as determined via magnetometry and small-angle neutron scattering (SANS). Meanwhile, while previous magnetometry characterization suggests two high temperature skyrmion phases in the Zn-substituted sample, SANS reveals the high temperature phase to be skyrmionic while we are unable to distinguish the other from helical order. Overall, chemical substitution weakens helical and skyrmion order as inferred from neutron scattering of the $|$q$| \approx$ 0.01 $Å^{-1}$ magnetic peak.
