Discovery of charge density wave in a kagome lattice antiferromagnet
Discovery of charge density wave in a kagome lattice antiferromagnet
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DOI：
10.1038/s41586-022-05034-z
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发表时间：
2022-03
期刊：
影响因子：
64.8
通讯作者：
Xiaokun Teng;Lebing Chen;F. Ye;E. Rosenberg;Zhaoyu Liu;Jia-Xin Yin;Yu-Xiao Jiang;J. Oh;M. Z. Ha
中科院分区：
文献类型：
--
作者：
Xiaokun Teng;Lebing Chen;F. Ye;E. Rosenberg;Zhaoyu Liu;Jia-Xin Yin;Yu-Xiao Jiang;J. Oh;M. Z. Ha
强关联量子材料的一个特点是丰富的相图，这些相图是由竞争和交织的相产生的，基态能量几乎是简并的。一个著名的例子是铜氧化物，其中电荷密度波(CDW)被排列在远高于磁序的位置，并与磁序强烈耦合，形成与超导竞争的自旋电荷分离的条带。最近，这种丰富的相图也被显示在相关的拓扑材料中。在由角共享三角形组成的二维Kagome晶格金属中，晶格的几何形状可以产生具有局域电子、非平凡拓扑、-、手征磁序、超导电性和CDW序数的平带。虽然已经在弱电子相关的非磁性化合物AV3Sb5(A= K，Rb，Cs)，，，-中发现了CDW，但尚未在相关磁有序Kagome晶格金属，，，-中观察到CDW。本文报道了在Kagome晶格FeGe的反铁磁(AFM)有序相中发现了CDW。FeGe中的CDW发生在与AV3Sb5相同的波矢上(参考文献，，，-)，增强了AFM有序矩，并引起了突然的反常霍尔效应。我们的发现表明，FeGe中的CDW是由电子相关性驱动的AFM有序和Van Hove奇点(VHS)驱动的不稳定性的组合产生的，这可能与手性通量相…，-有关，这与强关联的铜氧化物和镍酸盐-形成鲜明对比，其中CDW先于或伴随着磁序。
A hallmark of strongly correlated quantum materials is the rich phase diagram resulting from competing and intertwined phases with nearly degenerate ground-state energies,. A well-known example is the copper oxides, in which a charge density wave (CDW) is ordered well above and strongly coupled to the magnetic order to form spin-charge-separated stripes that compete with superconductivity,. Recently, such rich phase diagrams have also been shown in correlated topological materials. In 2D kagome lattice metals consisting of corner-sharing triangles, the geometry of the lattice can produce flat bands with localized electrons,, non-trivial topology, –, chiral magnetic order,, superconductivity and CDW order, , , , –. Although CDW has been found in weakly electron-correlated non-magneticAV3Sb5(A= K, Rb, Cs), , , , –, it has not yet been observed in correlated magnetic-ordered kagome lattice metals,, , , , –. Here we report the discovery of CDW in the antiferromagnetic (AFM) ordered phase of kagome lattice FeGe (refs., , –). The CDW in FeGe occurs at wavevectors identical to that ofAV3Sb5(refs., , , , –), enhances the AFM ordered moment and induces an emergent anomalous Hall effect,. Our findings suggest that CDW in FeGe arises from the combination of electron-correlations-driven AFM order and van Hove singularities (vHSs)-driven instability possibly associated with a chiral flux phase, , , –, in stark contrast to strongly correlated copper oxides,and nickelates, –, in which the CDW precedes or accompanies the magnetic order.