Magnetic-Field Control of Topological Electronic Response near Room Temperature in Correlated Kagome Magnets

Li, Yangmu; Wang, Qi; DeBeer‐Schmitt, Lisa; Guguchia, Zurab; Desautels, R. D.; Yin, Jia Xin; Du, Qiang; Ren, Weijun; Zhao, Xinguo; Zhang, Zhidong; Zaliznyak, Igor; Petrović, C.; Yin, Wei‐Guo; Hasan, M. Zahid; Lei, Hechang; Tranquada, J. M.

doi:10.1103/physrevlett.123.196604

Cited by 28 publications

(17 citation statements)

References 35 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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“…The ratio F/m * is always close to E D /2eℏ, strongly supporting that the main quantum oscillation orbit α in transport is stemming from the Chern-gapped Dirac fermion. This is unlike the case of Fe 3 Sn 2 whose electron mass and gap size can be easily tuned by an external magnetic field 15,26,31 . The strong coupling between 4f and 3d electrons in TbMn 6 Sn 6 , which is absent in other transition-metal-bearing kagome magnets, guarantees a stable out-of-plane ferromagnetic Mn sublattice even in an extremely large external field and temperature range 30 .…”

Section: Resultsmentioning

confidence: 96%

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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“…The ratio F/m * is always close to E D /2eh, strongly supporting that the main quantum oscillation orbit α in transport is stemming from the Chern-gapped Dirac fermion. This is unlike the case of Fe 3 Sn 2 whose electron mass and gap size can be easily tuned by an external magnetic field 15,26,31 . The strong coupling between 4f and 3d electrons in TbMn 6 Sn 6 , which is absent in other transition-metal-bearing kagome magnets, guarantees a stable out-of-plane ferromagnetic Mn sublattice even in an extremely large external field and temperature range 30 .…”

mentioning

confidence: 96%

Topological charge-entropy scaling in kagome Chern magnet TbMn$_6$Sn$_6$

Xu,

Yin,

et al. 2021

Preprint

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In ordinary materials, electrons conduct both electricity and heat, where their chargeentropy relations observe the Mott formula and the Wiedemann-Franz law 1, 2 . In topological quantum materials, the transverse motion of relativistic electrons can be strongly affected by the quantum field arising around the topological fermions 3 , 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 TbMn 6 Sn 6 , 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 chargeentropy scaling.

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Magnetic-Field Control of Topological Electronic Response near Room Temperature in Correlated Kagome Magnets

Cited by 28 publications

References 35 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

Topological charge-entropy scaling in kagome Chern magnet TbMn$_6$Sn$_6$

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