轴子绝缘体候选材料EuIn$_{2}$As$_{2}$中非化学计量比诱导的非公度破缺螺旋态
Incommensurate broken helix induced by nonstoichiometry in the axion insulator candidate EuIn$_{2}$As$_{2}$
AI总结：
本研究针对轴子绝缘体候选材料EuIn$_{2}$As$_{2}$的磁结构争议开展共振X射线散射实验，发现其破缺螺旋态为非公度且具样品依赖性，提出Eu缺陷诱导的巡游特性阻碍了共线反铁磁轴子态的实现。
摘要：
Zintl相EuIn$_{2}$As$_{2}$作为轴子绝缘体候选材料受到越来越多的关注，此前研究在其中发现了公度的双-${\bf Q}$破缺螺旋态，但该态的周期性和对称性仍存在争议。本研究对EuIn$_{2}$As$_{2}$开展了共振X射线散射实验，揭示出破缺螺旋态具有非公度特性，其螺旋调制的波数和振幅均表现出系统性的样品依赖性。此外，施加面内磁场会产生一种似乎保留双-${\bf Q}$特性的扇状态，这可能源于动量空间中的多自旋相互作用。我们提出，EuIn$_{2}$As$_{2}$的巡游特性极有可能由Eu缺陷诱导，该特性会引发螺旋调制，并阻碍理论预测的具有共线反铁磁序的轴子态的实现。
英文摘要：
Zintl phase EuIn$_{2}$As$_{2}$ has garnered growing attention as an axion insulator candidate, triggered by the identification of a commensurate double-${\mathbf Q}$ broken-helix state in previous studies, however, its periodicity and symmetry remain subjects of debate. Here, we perform resonant x-ray scattering experiments on EuIn$_{2}$As$_{2}$, revealing an incommensurate nature of the broken-helix state, where both the wave number and the amplitude of the helical modulation exhibit systematic sample dependence. Furthermore, the application of an in-plane magnetic field brings about a fanlike state that appears to preserve the double-${\mathbf Q}$ nature, which might be attributed to multiple-spin interactions in momentum space. We propose that the itinerant character of EuIn$_{2}$As$_{2}$, most likely induced by Eu deficiency, gives rise to the helical modulation and impedes the realization of a theoretically-predicted axion state with the collinear antiferromagnetic order.
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