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Article
Physics, Multidisciplinary
Titus Neupert et al.
Summary: Superconductivity and ordered states have been observed in a family of kagome materials, with lattice geometry, topological electron behavior, and competition between ground states playing key roles in determining material properties. The compounds KV3Sb5, CsV3Sb5, and RbV3Sb5 exhibit a kagome net of vanadium atoms, showing superconductivity at low temperatures and unusual charge order at high temperatures, connecting to the underlying topological nature of the band structure. This highlights the importance of these discoveries in the context of wider research efforts in topological physics and superconductivity, while also discussing open problems in this field.
Article
Multidisciplinary Sciences
Hailan Luo et al.
Summary: This study reveals the electronic nature of the charge density wave (CDW) phase in Kagome superconductors AV(3)Sb(5). Through high-resolution angle-resolved photoemission measurements, CDW-induced Fermi surface reconstruction and band folding are observed, and the Fermi surface- and momentum-dependent CDW gap is measured, showing a strongly anisotropic CDW gap. Furthermore, the authors observe signatures of the electron-phonon coupling in KV3Sb5.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Ece Uykur et al.
Summary: In this study, we discover unconventional localized carriers with strong renormalization across the density-wave transition in KV3Sb5 through optical spectroscopy and density-functional calculations. We also observe strong phonon anomalies not only below the density-wave transition, but also at high temperatures, indicating a complex interplay between phonons and the underlying electronic structure. We propose star-of-David and tri-hexagon configurations for the density-wave order in KV3Sb5, which resemble the p-wave states expected in the Hubbard model on the kagome lattice with van Hove singularity filling.
NPJ QUANTUM MATERIALS
(2022)
Article
Multidisciplinary Sciences
Heda Zhang et al.
Summary: This study discovers that kagome metal TbMn6Sn6 is a ferrimagnetic topological Dirac material and observes its asymmetrical anomalous Nernst effect and anomalous thermal Hall effect. First-principles calculations demonstrate that the anomalous transverse transport is consistent with the Berry curvature contribution from the massive Dirac gaps in the 3D momentum space. Additionally, the transverse thermoelectric transport exhibits an exchange-bias behavior with respect to the applied magnetic field.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Xitong Xu et al.
Summary: The authors report a topological charge-entropy relation in TbMn6Sn6, demonstrating the existence of Chern-gapped Dirac fermions in the magnetic kagome lattice and providing insights into their topological charge-entropy scaling.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
S. X. M. Riberolles et al.
Summary: TbMn6Sn6 is a metallic ferrimagnet with both topological electrons and topological magnons. The Mn kagome layer in TbMn6Sn6 exhibits strong ferromagnetic interactions and strong FM Mn-Mn and AFM Mn-Tb interlayer magnetic couplings. Compared to other RMn6Sn6 compounds, TbMn6Sn6 has weaker Mn-Mn interlayer interactions, resulting in a highly stable three-dimensional ferrimagnetic network.
Article
Physics, Multidisciplinary
C. Mielke et al.
Summary: Using muon spin rotation, local field analysis, and neutron diffraction, we studied the magnetic correlations of the Kagome magnet TbMn6Sn6. We identified an out-of-plane ferrimagnetic structure with slow magnetic fluctuations and found that hydrostatic pressure can stabilize the static magnetic ground state.
COMMUNICATIONS PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
F. Schilberth et al.
Summary: This study investigates the quantum Hall effect and anomalous Hall effect in kagome materials, and probes the band structure features through optical conductivity spectra. The results show that low-energy transitions contribute significantly to the anomalous Hall effect, which is further enhanced by contributions from higher-energy interband transitions. The study also reveals band reconstructions near the Fermi level due to local Coulomb interactions.
Article
Materials Science, Multidisciplinary
M. Wenzel et al.
Summary: Temperature-dependent reflectivity studies have been conducted on the nonmagnetic kagome metal RbV3Sb5, revealing the spectral characteristics in a broad energy range. The observations indicate the formation of charge-density wave and the significance of electron-phonon coupling.
Article
Materials Science, Multidisciplinary
X. Gu et al.
Summary: The researchers systematically investigated the electronic structure of XMn6Sn6 family compounds using high-resolution angle-resolved photoemission spectroscopy and ab initio calculation. They observed that the flat band arising from the magnetic kagome lattice of Mn atoms is located in the same energy region across all compounds, regardless of their different magnetic ground states and 4 f electronic configurations.
Article
Physics, Applied
Lingling Gao et al.
Summary: The study investigated the magnetic and transport properties of RMn6Sn6 (R = Tb, Dy, Ho) compounds with clean Mn kagome lattice, revealing distinct collinear ferrimagnetic structures and changing magnetoresistance with temperature. An intrinsic anomalous Hall conductivity was observed for each compound, suggesting RMn6Sn6 system as a promising platform for exploring related topological or quantum phenomena in future research.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Multidisciplinary
Wenlong Ma et al.
Summary: Rare-earth magnet RMn6Sn6 exhibits quantum transport properties similar to TbMn6Sn6, indicating the presence of Chern gapped Dirac fermions. This suggests that rare-earth elements can effectively manipulate the Chern quantum phase in kagome magnets, demonstrating a close relationship between rare-earth magnetism and topological electron structure.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Man Li et al.
Summary: The observation of a Dirac cone, flat band, and saddle point near the Fermi energy in ferromagnetic Kagome material YMn6Sn6 presents potential opportunities for manipulating topological properties and multi-orbital magnetism.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Simone Fratini et al.
Summary: This study illustrates and characterizes the phenomenon of transient localization of current-carrying electrons in metals caused by scattering from slowly fluctuating degrees of freedom, leading the system away from normal metallic behavior. Strong interactions at metallic densities enhance electron localization and the emergence of a displaced Drude peak (DDP), altering low frequency optical response and suppressing d.c. conductivity. This phenomenon is commonly observed in electronic systems where slowly fluctuating degrees of freedom significantly couple to charge carriers.
Article
Materials Science, Multidisciplinary
Gyanendra Dhakal et al.
Summary: Recent studies have shown that the RMn6Sn6 compound family may be intriguing to investigate various physical phenomena due to its large spin-orbit coupling and strong magnetic ordering. Measurements of magnetic, magnetotransport, and angle-resolved photoemission spectroscopy in ErMn6Sn6 demonstrate antiferromagnetic to ferrimagnetic phase transitions in the presence of a field, revealing nontrivial transport signatures and anisotropic magnetization behavior.
Article
Materials Science, Multidisciplinary
Zhonghao Liu et al.
Summary: The study found that GdMn6Sn6 with a Mn kagome lattice exhibits typical kagome electronic dispersions around the Fermi energy, and electronic correlation effectively modulates the Dirac dispersions.
Article
Materials Science, Multidisciplinary
E. Uykur et al.
Summary: Temperature-dependent reflectivity measurements were conducted on the kagome metal CsV3Sb5 in a wide frequency range, with notable spectral-weight transfer attributed to the charge-density wave (CDW) formed below 94 K. A CDW gap of 60-75 meV was observed at the lowest temperature, showing significant deviations from an isotropic BCS-type mean-field behavior. The interband absorption peaks, as low as 200 cm(-1), are associated with band transitions according to density-functional calculations, with differences observed between CsV3Sb5 and KV3Sb5 compounds. Additionally, a temperature-dependent absorption feature below 1000 cm(-1) was assigned to a displaced Drude peak, indicating localization effects on charge carriers.
Article
Materials Science, Multidisciplinary
C. Q. Xu et al.
Summary: This study reveals that as the Ga substitution increases, the magnetic ground state of YMn6Sn6-xGax transitions from an incommensurate antiferromagnet to a ferromagnet, accompanied by a decrease in magnetoresistance. Furthermore, the observed topological Hall effect in the pristine compound is no longer present in the Ga-substituted compounds, with the persistent anomalous Hall effect possibly associated with the Berry curvature of gapped Dirac bands near the Fermi energy.
Article
Materials Science, Multidisciplinary
Wenlong Ma et al.
Summary: NdMn6Sn6 and SmMn6Sn6 are high-temperature ferromagnets with distorted Mn-based kagome lattice structures, exhibiting a large intrinsic anomalous Hall effect.
Article
Materials Science, Multidisciplinary
Qi Wang et al.
Summary: Geometric frustration in the kagome lattice provides a great platform for flat electronic bands, nontrivial topological properties, and novel magnetism. The study shows the occurrence of topological Hall effect in centrosymmetric YMn6Sn6, which is attributed to an in-plane field-induced double-fan spin structure rather than a magnetic skyrmion lattice. This research offers insights into the impact of field-induced unique magnetic structures on magnetoelectric response in topological kagome metals.
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Mingu Kang et al.
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Yinming Shao et al.
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A. Biswas et al.
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(2020)
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Zhonghao Liu et al.
NATURE COMMUNICATIONS
(2020)
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J-X Yin et al.
NATURE COMMUNICATIONS
(2020)
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Nirmal J. Ghimire et al.
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T. Asaba et al.
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H. Zhang et al.
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D. F. Liu et al.
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Brenden R. Ortiz et al.
PHYSICAL REVIEW MATERIALS
(2019)
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Neeraj Kumar et al.
Article
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Zhiyong Lin et al.
PHYSICAL REVIEW LETTERS
(2018)
Article
Physics, Multidisciplinary
Luca V. Delacretaz et al.
Article
Materials Science, Multidisciplinary
D. B. Tanner
Article
Physics, Multidisciplinary
Gang Xu et al.
PHYSICAL REVIEW LETTERS
(2015)
Article
Physics, Condensed Matter
Per Soederlind et al.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2014)
Article
Materials Science, Multidisciplinary
S. Fratini et al.
Article
Materials Science, Multidisciplinary
Wan-Sheng Wang et al.
Article
Chemistry, Physical
D. I. Gorbunov et al.
JOURNAL OF ALLOYS AND COMPOUNDS
(2012)
Article
Materials Science, Multidisciplinary
Sh. Tabatabai Yazdi et al.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2011)
Article
Physics, Multidisciplinary
M. M. Qazilbash et al.
Article
Physics, Condensed Matter
Melissa Petersen et al.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2006)
Article
Computer Science, Interdisciplinary Applications
Claudia Ambrosch-Draxl et al.
COMPUTER PHYSICS COMMUNICATIONS
(2006)
Letter
Physics, Multidisciplinary
M Mekata
