论文标题
在基于结核病的二十面体列晶中的磁性和拓扑
Magnetism and topology in Tb-based icosahedral quasicrystal
论文作者
论文摘要
准晶（QC）具有独特的晶格结构，在常规晶体中禁止使用旋转对称性。电力性能远非完全理解，这是一个长期存在的问题，即QC中是否实现了磁性远程顺序。主要困难是缺乏显微镜理论来分析QC中稀土原子的晶体电场（CEF）的影响。在这里，我们显示了基于结核病的QC中CEF的完整微观分析。我们发现，CEF引起的磁各向异性在实现二十面体上的独特磁纹理方面起着关键作用，其顶点TB原子位于。我们的分析表明，在基于结核病的QC中稳定了以拓扑费为特征的刺猬的远距离顺序。我们还发现，旋转时的状态的特征是三个的拓扑表现异常大。磁纹理以及拓扑状态被证明是通过控制三元化合物中非稀土元素的组成来切换的。我们的模型可用于了解稀有地球QC和大约晶体中的磁性以及拓扑特性。
Quasicrystal (QC) possesses a unique lattice structure with rotational symmetry forbidden in conventional crystals. The electric property is far from complete understanding and it has been a long-standing issue whether the magnetic long-range order is realized in the QC. The main difficulty was lack of microscopic theory to analyze the effect of the crystalline electric field (CEF) at the rare-earth atom in QCs. Here we show the full microscopic analysis of the CEF in Tb-based QCs. We find that magnetic anisotropy arising from the CEF plays a key role in realizing unique magnetic textures on the icosahedron whose vertices Tb atoms are located at. Our analysis suggests that the long-range order of the hedgehog characterized by the topological charge of one is stabilized in the Tb-based QC. We also find that the whirling-moment state is characterized by unusually large topological charge of three. The magnetic textures as well as the topological states are shown to be switched by controlling compositions of the non-rare-earth elements in the ternary compounds. Our model is useful to understand the magnetism as well as the topological property in the rare-earth-based QCs and approximant crystals.
