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Ma, Wenlong; Xu, Xitong; Yin, Jiaxin; Yang, Hui; Zhou, Huibin; Cheng, Zi-Jia; Huang, Yuqing; Qu, Zhe; Wang, Fa; Hasan, M. Zahid; Jia, Shuang

doi:10.1103/physrevlett.126.246602

Cited by 119 publications

(40 citation statements)

References 41 publications

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“…Thus, materials containing kagome lattices are an exciting platform to explore the quantum level interplay between geometry, correlation, and topology. For instance, certain kagome magnets are found to exhibit electronic nematicity, giant spin-orbit tunability, and topological Chern quantum phases [3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Kagome superconductors with competing orders have been identified for over 40 y [17][18][19], such as LaRu 3 Si 2 with T C of 7 K and a fundamental kagome band structure [20].…”

Section: Introductionmentioning

confidence: 99%

Electronic nature of chiral charge order in the kagome superconductor CsV3Sb5

et al. 2021

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Kagome superconductors with T C up to 7 K have been discovered for over 40 y. Recently, unconventional chiral charge order has been reported in kagome superconductor KV 3 Sb 5 , with an ordering temperature of one order of magnitude higher than the T C . However, the chirality of the charge order has not been reported in the cousin kagome superconductor CsV 3 Sb 5 , and the electronic nature of the chirality remains elusive. In this paper, we report the observation of electronic chiral charge order in CsV 3 Sb 5 via scanning tunneling microscopy (STM). We observe a 2 × 2 charge modulation and a 1 × 4 superlattice in both topographic data and tunneling spectroscopy. 2 × 2 charge modulation is highly anticipated as a charge order by fundamental kagome lattice models at van Hove filling, and is shown to exhibit intrinsic chirality. We find that the 1 × 4 superlattices form various small domain walls, and can be a surface effect as supported by our first-principles calculations. Crucially, we find that the amplitude of the energy gap opened by the charge order exhibits real-space modulations, and features 2 × 2 wave vectors with chirality, highlighting the electronic nature of the chiral charge order. STM study at 0.4 K reveals a superconducting energy gap with a gap size 2 = 0.85 meV, which estimates a moderate superconductivity coupling strength with 2 /k B T C = 3.9. When further applying a c-axis magnetic field, vortex core bound states are observed within this gap, indicative of clean-limit superconductivity.

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Section: Introductionmentioning

confidence: 99%

Electronic nature of chiral charge order in the kagome superconductor CsV3Sb5

et al. 2021

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“…Magnetic exchange interaction splits the spin-up and spin-down Dirac cones, while the combination of out-of-plane magnetization and Kane-Mele type spin-orbit coupling further opens the Chern gap for the spin-polarized Dirac fermions. Though the spectroscopic and some preliminary electric transport data have been reported 16,17 , the quantum transport behavior of this kagome Chern magnet remains largely unveiled, which questions the key topological transport features of Chern-gapped Dirac fermions. Here we use the combination of electric, thermoelectric and thermal transport to characterize this quantum magnet and to discover its topological charge-entropy scaling.…”

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confidence: 94%

“…The former provides the source of topological nontrivial band structure, while the latter can drive magnetic instabilities. In this regard, several transition metal based kagome magnets are of current interest, which exhibit many-body interplays and Chern quantum phases [8][9][10][11][12][13][14][15][16][17][18] . Among these kagome magnets, TbMn 6 Sn 6 stands out owing to its pristine kagome lattice (without other atoms in the kagome lattice plane) and strong outof-plane magnetization (persisting to above room temperature).…”

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confidence: 99%

Topological charge-entropy scaling in kagome Chern magnet TbMn6Sn6

Yin

et al. 2022

Nat Commun

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In ordinary materials, electrons conduct both electricity and heat, where their charge-entropy relations observe the Mott formula and the Wiedemann-Franz law. In topological quantum materials, the transverse motion of relativistic electrons can be strongly affected by the quantum field arising around the topological fermions, where a simple model description of their charge-entropy relations remains elusive. Here we report the topological charge-entropy scaling in the kagome Chern magnet TbMn6Sn6, featuring pristine Mn kagome lattices with strong out-of-plane magnetization. Through both electric and thermoelectric transports, we observe quantum oscillations with a nontrivial Berry phase, a large Fermi velocity and two-dimensionality, supporting the existence of Dirac fermions in the magnetic kagome lattice. This quantum magnet further exhibits large anomalous Hall, anomalous Nernst, and anomalous thermal Hall effects, all of which persist to above room temperature. Remarkably, we show that the charge-entropy scaling relations of these anomalous transverse transports can be ubiquitously described by the Berry curvature field effects in a Chern-gapped Dirac model. Our work points to a model kagome Chern magnet for the proof-of-principle elaboration of the topological charge-entropy scaling.

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“…For TbMn 6 Sn 6 , a SOC-induced gap opens at the Dirac point, mainly consisting of in-plane Mn orbitals, at 0.2 eV above the Fermi level has been found in density functional theory (DFT) calculations [1]. Experimentally, Ma and coworkers [5] systematically investigated the topological transport in the RMn 6 Sn 6 family and found that the effective Chern gap and the Dirac cone energy decrease from R = Gd to Er. However, how electronic structures evolve with R elements and temperatures through spin reorientation is not well understood.…”

Section: Introductionmentioning

confidence: 94%

“…The rare-earth Tb atoms, possessing a strong easy-axis magnetocrystalline anisotropy (MA), * liqinke@ameslab.gov antiferromagnetically couple with the Mn atoms and align the Mn spins along the out-of-plane direction below the spin-reorientation temperatures T SR . This discovery of quantum-limit Chern topological magnetism in TbMn 6 Sn 6 has rekindled the interest in the RMn 6 Sn 6 family of compounds, where different R atoms and correspondingly a variety of magnetic structures provide a rich platform to explore quantum phenomena [5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Interplay between magnetism and band topology in Kagome magnets $R$Mn$_6$Sn$_6$

Lee¹,

Skomski²,

Wang³

et al. 2022

Preprint

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Kagome-lattice magnets RMn6Sn6 recently emerged as a new platform to exploit the interplay between magnetism and topological electronic states. Using ab initio methods, we systematically investigate the electronic structures and intrinsic magnetic properties in RMn6Sn6 with R = Gd, Tb, Dy, Ho, and Er. We reveal a non-monotonic dependence of the magnetocrystalline anisotropy energy on the spin quantization for all RMn6Sn6, except for R = Gd. Moreover, the Mn sublattice exhibits easy-plane anisotropy of similar amplitude in all RMn6Sn6 compounds. Our results show that TbMn6Sn6 has an easy-axis anisotropy, while DyMn6Sn6 and HoMn6Sn6 have easy-cone anisotropy, and GdMn6Sn6 and ErMn6Sn6 have easy-plane anisotropy. These numerical findings all agree well with the experiment and are fully consistent with the Mn coordination of the R atoms. The observed band structures of various RMn6Sn6 compounds share great similarities near the Fermi level as they mainly consist of non-4f bands. Multiple Dirac crossings occur at the Brillouin zone corners, opened by spin-orbit coupling (SOC). Most of these crossings are strongly kz-dependent. The most prominent 2D-like Dirac crossing that can be effectively gapped by SOC lies ∼ 0.7 eV above the Fermi level, much higher than in previously reported band structures calculated in density functional theory [Ref. 1]. The inclusion of electron correlations within Mn-3d electrons, however, can significantly lower this SOC-gapped crossing closer to the Fermi level, making it more relevant for the observation of topological phenomena. Finally, we predict an enhancement of the Mn magnetic moment on the RMn6Sn6 surface, which may impact the topological band structures of surfaces or thin films, and is yet to be confirmed experimentally.

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Rare Earth Engineering inRMn6Sn6(R=

Cited by 119 publications

References 41 publications

Electronic nature of chiral charge order in the kagome superconductor CsV3Sb5

Electronic nature of chiral charge order in the kagome superconductor CsV3Sb5

Topological charge-entropy scaling in kagome Chern magnet TbMn6Sn6

Interplay between magnetism and band topology in Kagome magnets $R$Mn$_6$Sn$_6$

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