Discovery of charge density wave in a kagome lattice antiferromagnet

Teng, Xiaokun; Chen, Lebing; Ye, Feng; Rosenberg, Elliott; Liu, Zhaoyu; Yin, Jia-Xin; Jiang, Yu-Xiao; Oh, Ji Seop; Hasan, M. Zahid; Neubauer, Kelly J.; Gao, Bin; Xie, Yaofeng; Hashimoto, M.; Lu, D. H.; Jozwiak, Chris; Bostwick, Aaron; Rotenberg, Eli; Birgeneau, R. J.; Chu, Jiun‐Haw; Yi, Ming; Dai, Pengcheng

doi:10.1038/s41586-022-05034-z

Cited by 133 publications

(102 citation statements)

References 45 publications

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“…1(e) and its inset demonstrates the 2 × 2 vector peaks from the charge order in addition to the Bragg peaks of the lattice. The 2 × 2 vector peaks are consistent with the wave vector of bulk charge order obtained in our neutron study of FeGe [29]. The three pairs of 2 × 2 vector peaks feature different intensities as shown in Fig.…”

supporting

confidence: 88%

“…2(a)]. The spin-flip field for FeGe is known [29] to exceed 10 T, beyond our instrumental capability, and thus we can safely determine that our low magnetic field only flips the spin of the magnetic tip. Figure 2(b) shows dI=dV maps taken at E F for the same nanoregion in Fig.…”

mentioning

confidence: 88%

“…Therefore, tunneling directly into the kagome lattice is essential to probe the intrinsic features of the kagome charge order, and is particularly important to solving puzzles regarding different behaviors of the charge order on nonkagome surfaces [7,[18][19][20][21][22][23][24][25][26]. Recently, our combined neutron scattering [29], STM, and photoemssion experiments on kagome antiferromagnet FeGe unexpectedly detected a superlattice signal around 100 K, suggesting it likely to be a kagome charge order platform. According to the STM study on CoSn-a cousin material to FeGe-the atomic kagome lattice layer can be prepared as the surface termination through cryogenic cleaving [28], offering us an unprecedented opportunity to explore the kagome charge order at the microscopic level.…”

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confidence: 99%

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Discovery of Charge Order and Corresponding Edge State in Kagome Magnet FeGe

et al. 2022

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Kagome materials often host exotic quantum phases, including spin liquids, Chern gap, charge density wave, and superconductivity. Existing scanning microscopy studies of the kagome charge order have been limited to nonkagome surface layers. Here, we tunnel into the kagome lattice of FeGe to uncover features of the charge order. Our spectroscopic imaging identifies a 2 × 2 charge order in the magnetic kagome lattice, resembling that discovered in kagome superconductors. Spin mapping across steps of unit cell height demonstrates the existence of spin-polarized electrons with an antiferromagnetic stacking order. We further uncover the correlation between antiferromagnetism and charge order anisotropy, highlighting the unusual magnetic coupling of the charge order. Finally, we detect a pronounced edge state within the charge order energy gap, which is robust against the irregular shape fluctuations of the kagome lattice edges. We discuss our results with the theoretically considered topological features of the kagome charge order including unconventional magnetism and bulk-boundary correspondence.

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confidence: 88%

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confidence: 88%

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confidence: 99%

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Discovery of Charge Order and Corresponding Edge State in Kagome Magnet FeGe

et al. 2022

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“…The main result of this work is the prominent transition near 95 K in the ρ( T ). Very similar transition features were observed in the ρ ( T ) of some Kagome metals, such as the AV 3 Sb 5 (A = K, Cs, and Rb) family and the antiferromagnetic Kagome metal FeGe, between 75 and 100 K. These transitions were found to be the result of superlattice formation from CDW ordering. − , To reveal whether there was a corresponding structural transition in Yb 0.5 Co 3 Ge 3 , we performed single-crystal X-ray diffraction above and below the transition temperature. Figure a,b shows the projection of the X-ray diffraction pattern along the a -axis ( b – c plane) and c -axis ( a – b plane) in reciprocal space, respectively.…”

Section: Resultsmentioning

confidence: 72%

“…While some phases (AV 3 Sb 5 ) have shown electronic correlation-related charge orders and topology, others have shown topology and magnetism. − Studies are ongoing on Kagome systems which show correlation and magnetism, where charge/spin orders intertwine with magnetic orders of a spin sublattice. It has been shown that the structural distortions of the Kagome lattice and symmetry breaking are closely related to the appearance of new orders, including the symmetry breaking CDW order observed in AV 3 Sb 5 compounds and antiferromagnetic FeGe . How the various orders work together, or compete with each other, and what effect that has on structural distortions in the Kagome net and the resulting physical properties remain an active area of investigation.…”

Section: Introductionmentioning

confidence: 99%

Electronic Properties and Phase Transition in the Kagome Metal Yb_0.5Co₃Ge₃

Wang

McCandless

et al. 2022

Chem. Mater.

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The Kagome lattice is an important fundamental structure in condensed matter physics for investigating the interplay of electron correlation, topology, and frustrated magnetism. Recent work on Kagome metals in the AV 3 Sb 5 (A = K, Rb, and Cs) family has shown a multitude of correlation-driven distortions, including symmetry breaking charge density waves and nematic superconductivity at low temperatures. Here, we study the new Kagome metal Yb 0.5 Co 3 Ge 3 and find a temperature-dependent kink in the resistivity that is highly similar to the AV 3 Sb 5 behavior and is commensurate with an in-plane structural distortion of the Co Kagome lattice along with a doubling of the c-axis. The symmetry is lower below the transition temperature, with a breaking the in-plane mirror planes and C 6 rotation, while gaining a screw axis along the c-direction. At very low temperatures, anisotropic negative magnetoresistance is observed, which may be related to anisotropic magnetism. This raises questions about the types of the distortions in Kagome nets and their resulting physical properties including superconductivity and magnetism.

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Large Anomalous Hall Effect at Room Temperature in a Fermi‐Level‐Tuned Kagome Antiferromagnet

Song,

Zhou,

et al. 2024

Adv Funct Materials

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The recent discoveries of surprisingly large anomalous Hall effect (AHE) in antiferromagnets have attracted much attention due to their promising use in spintronics devices. However, such AHE‐hosting antiferromagnetic materials are rare in nature. Herein, it is demonstrated that Mn2.4Ga, a Fermi‐level‐tuned kagome antiferromagnet, has a large anomalous Hall conductivity of ≈150 Ω−1 cm−1 at room temperature that surpasses the usual high values (i.e., 20–50 Ω−1 cm−1) observed so far in two outstanding kagome antiferromagnets, Mn3Sn and Mn3Ge. Although the triangular spin structure of Mn2.4Ga shows a weak net magnetic moment of ≈0.05 µB per formula unit, it guarantees a nonzero Berry curvature in the kagome plane. Moreover, the anomalous Hall conductivity exhibits a sign reversal with the rotation of a small magnetic field that can be ascribed to the field‐controlled chirality of the spin triangular structure. This theoretical calculations further suggest that the large AHE in Mn2.4Ga originates from a significantly enhanced Berry curvature associated with the tuning of the Fermi level close to the Weyl points. These properties, together with the ability to manipulate moment orientations using a moderate external magnetic field, make Mn2.4Ga extremely exciting for future antiferromagnetic spintronics.

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Discovery of charge density wave in a kagome lattice antiferromagnet

Cited by 133 publications

References 45 publications

Discovery of Charge Order and Corresponding Edge State in Kagome Magnet FeGe

Discovery of Charge Order and Corresponding Edge State in Kagome Magnet FeGe

Electronic Properties and Phase Transition in the Kagome Metal Yb_0.5Co₃Ge₃

Large Anomalous Hall Effect at Room Temperature in a Fermi‐Level‐Tuned Kagome Antiferromagnet

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Discovery of charge density wave in a kagome lattice antiferromagnet

Cited by 133 publications

References 45 publications

Discovery of Charge Order and Corresponding Edge State in Kagome Magnet FeGe

Discovery of Charge Order and Corresponding Edge State in Kagome Magnet FeGe

Electronic Properties and Phase Transition in the Kagome Metal Yb0.5Co3Ge3

Large Anomalous Hall Effect at Room Temperature in a Fermi‐Level‐Tuned Kagome Antiferromagnet

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Electronic Properties and Phase Transition in the Kagome Metal Yb_0.5Co₃Ge₃