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Article
Physics, Multidisciplinary
Mingu Kang et al.
Summary: This study combines angle-resolved photoemission spectroscopy and density functional theory to reveal the presence of multiple kagome-derived van Hove singularities (vHS) in CsV3Sb5 and their contribution to electronic symmetry breaking. These vHS critically determine the pairing symmetry and unconventional ground states emerging in the AV(3)Sb(5) series.
Article
Physics, Multidisciplinary
Hong Li et al.
Summary: Recently discovered AV(3)Sb(5) superconductors provide a fresh opportunity to study correlation-driven electronic phenomena on a kagome lattice. Using scanning tunnelling microscopy, researchers have found pronounced intensity anisotropy in the charge density wave of KV3Sb5, with one direction being distinctly different compared to the other two. Additionally, the CDW phase is unaffected by the magnetic-field direction, regardless of the presence or absence of atomic defects.
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
Physics, Multidisciplinary
Alexander A. Tsirlin et al.
Summary: The pressure evolution of the superconducting kagome metal CsV3Sb5 is studied using experimental and computational methods. The results show that pressure leads to a highly anisotropic compression due to the fast shrinkage of the Cs-Sb distances and suppression of Cs rattling motion. Additionally, it is found that Sb atoms play a central role in stabilizing the three-dimensional charge-density wave and Fermi surface reconstruction.
Article
Physics, Multidisciplinary
DianWu Song et al.
Summary: This study reveals the nature of density-wave-like transition in vanadium-based kagome superconductors through nuclear magnetic resonance measurements. It confirms the presence of a first-order structural transition and a three-dimensional structural modulation. The study suggests that the orbital order is the primary electronic order induced by the structural transition and provides evidence for possible orbital fluctuations.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Article
Multidisciplinary Sciences
Hui Chen et al.
Summary: In this study, unconventional superconductivity and a pair density wave (PDW) were observed in CsV3Sb5, a vanadium-based kagome metal. The material exhibits a V-shaped pairing gap and a 3Q PDW, along with other unique characteristics such as strong-coupling superconductivity and charge order. These findings provide insights into the correlated electronic states and superconductivity in vanadium-based kagome metals.
Article
Multidisciplinary Sciences
He Zhao et al.
Summary: In a new kagome superconductor CsV3Sb5, temperature-dependent cascade of different symmetry-broken electronic states including tri-directional charge order and V-shaped spectral gap opening are discovered. Additional breaking of the six-fold rotational symmetry and presence of an additional 4a(0) unidirectional charge order through the superconducting transition are observed. The experiments reveal a complex landscape of electronic states on a kagome lattice, with intriguing parallels to high-Tc superconductors and twisted bilayer graphene.
Article
Physics, Condensed Matter
Eric M. Kenney et al.
Summary: Muon spin relaxation and rotation measurements on the newly discovered kagome metal KV3Sb5 reveal a local field dominated by weak magnetic disorder associated with nuclear moments and showing a modest temperature dependence consistent with bulk magnetic susceptibility. The absence of evidence for V4+ local moments suggests that further studies are needed to understand the physics underlying the recently reported giant unconventional anomalous Hall effect in this material.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Physics, Multidisciplinary
Han-Shu Xu et al.
Summary: The study on the kagome superconductor CsV3Sb5 reveals multiband superconductivity, in-gap states induced by magnetic impurities, and different interactions between CDW and superconductivity on various bands. This provides critical clues for further understanding the relationship between superconductivity and CDW in CsV3Sb5.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Xianxin Wu et al.
Summary: The recent discovery of AV(3)Sb(5) has revealed an intriguing arena for exotic Fermi surface instabilities in a kagome metal, with superconductivity near multiple van Hove singularities showing indications of unconventional pairing. The sublattice interference mechanism is crucial in understanding the formation of superconductivity in a kagome metal, with nonlocal Coulomb repulsion, the sublattice profile of the van Hove bands, and the interaction strength being crucial parameters determining the preferred pairing symmetry. Implications for potentially topological surface states are discussed, along with a proposal for additional measurements to determine the nature of superconductivity in AV(3)Sb(5).
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Soohyun Cho et al.
Summary: Materials with layered kagome structures, particularly vanadium-based, have been found to exhibit topological properties with CDW characteristics, significant anomalous Hall effect, and unusual superconductivity at low temperatures. Angle-resolved photoemission spectroscopy reveals a partial energy gap opening at the boundary of the Brillouin zone upon the CDW transition in vanadium-based kagome material RbV3Sb5, suggesting a potential connection to the observed superconductivity.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
M. Michael Denner et al.
Summary: This article calculates the mechanism of electronically mediated charge density wave formation in kagome metals and finds that nematic chiral charge order is more likely. This helps to explain experimental results.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Brenden R. Ortiz et al.
Summary: This study reports the observation of bulk superconductivity in single crystals of the two-dimensional kagome metal KV3Sb5, with further characterization of the normal state as a Z(2) topological metal using density functional theory (DFT) calculations. The presence of superconductivity in the AV(3)Sb(5) (A: K, Rb, Cs) family of compounds suggests a common feature across these materials, establishing them as a rich arena for studying the interplay between bulk superconductivity, topological surface states, and likely electronic density wave order in an exfoliable kagome lattice.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Physics, Multidisciplinary
Zhonghao Liu et al.
Summary: The newly discovered Z(2) topological kagome metals AV(3)Sb(5) exhibit CDW phases and novel superconducting pairing states, with a focus on the key role of tuning van Hove singularities to the Fermi energy in ordering mechanisms. The bands around the Brillouin zone boundary in RbV3Sb5 shift to high-binding energy near the CDW transition temperature, forming an M-shaped band with singularities near the Fermi energy. The partially gapped Fermi surfaces and electronic states on residual bands may play a role in superconductivity.
Article
Physics, Multidisciplinary
Brenden R. Ortiz et al.
Summary: Through quantum oscillation measurements and density functional theory modeling, we have gained a deeper understanding of the charge density wave (CDW) instability in AV(3)Sb(5) kagome metals, proving that CDW triggers a reconstruction of Fermi surface pockets associated with vanadium orbitals and the kagome lattice framework, as well as identifying split oscillation frequencies originating from reconstructed pockets.
Article
Physics, Multidisciplinary
Qiangwei Yin et al.
Summary: The discovery of superconductivity in RbV3Sb5 single crystals with V kagome lattice is reported, showing a superconducting transition at around 0.92K. Anomalies in properties at T* around 102-103K are observed, possibly linked to the formation of a charge ordering state. The drastic change and sign reversal of the Hall coefficient R-H at T* can be partially explained by enhanced mobility of hole-type carriers, with quantum oscillations indicating the presence of small Fermi surfaces with low effective mass.
CHINESE PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Noah Ratcliff et al.
Summary: The discovery of the AV(3)Sb(5) material family has provided an exciting opportunity to study correlations, topology, and superconductivity in kagome metals. This study used coherent phonon spectroscopy and density functional theory calculations to investigate the charge density wave order in CsV3Sb5, revealing a tri-hexagonal ordering with interlayer modulation and providing a possible explanation for uniaxial order at lower temperatures in this material family.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Multidisciplinary Sciences
Xilin Feng et al.
Summary: The study identifies a chiral flux phase in the quasi-2D Kagome superconductor AV(3)Sb(5), which has the lowest energy and exhibits 2 x 2 charge orders observed experimentally. This phase breaks time-reversal symmetry and displays anomalous Hall effect.
Article
Physics, Multidisciplinary
Chao Mu et al.
Summary: CsV3Sb5 exhibits s-wave superconducting behavior at low temperatures, with superconductivity emerging in the charge order state. Split V-51 NMR spectra and Sb-121/123 NQR spectra were observed after the charge density wave, indicating a commensurate CDW state.
CHINESE PHYSICS LETTERS
(2021)
Article
Physics, Multidisciplinary
Shunli Ni et al.
Summary: The high-quality CsV3Sb5 single crystals exhibit excellent superconducting and mixed state properties, with a significant anisotropic ratio of Hc2(ab)/Hc2(c) and Hc1(ab)/Hc1(c) larger than 1. The orientation of the two-fold anisotropy in in-plane angular-dependent magnetoresistance displays a unique twist characteristic of the Kagome geometry at a characteristic temperature of around 2.8 K.
CHINESE PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Yu-Xiao Jiang et al.
Summary: The study reveals an unconventional chiral charge order in KV3Sb5, a material with both a topological band structure and a superconducting ground state, using high-resolution scanning tunnelling microscopy. A 2 x 2 superlattice structure is observed in the experiment, along with an energy gap opening and charge modulation across the Fermi level.
Article
Physics, Multidisciplinary
Hengxin Tan et al.
Summary: In this study, electronic and structural properties of the CDW phase in Kagome metals AV(3)Sb(5) were investigated using first-principles calculations. It was found that the CDW phase features an inverse Star of David structure, inherits nontrivial topological band structure, and has weak electron-phonon coupling indicating unconventional pairing mechanism for superconductivity. These results provide essential insights into the superconductivity and topology in Kagome metals.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
K. Y. Chen et al.
Summary: The study reveals that the CDW transition in CsV3Sb5 decreases with pressure, with an unusual M-shaped double dome in the T-c(P) curve showing enhancement up to 8 K at 2 GPa. This indicates a strong competition between CDW-like order and SC, particularly in the intermediate pressure range of P-c1 <= P <= P-c2.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Weiyin Duan et al.
Summary: CsV3Sb5 exhibits nodeless superconductivity consistent with two-gap s-wave superconductivity description, and is confirmed under multiple Fermi surfaces.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2021)
Article
Multidisciplinary Sciences
F. H. Yu et al.
Summary: The competition between superconductivity and CDW state in the pressurized kagome lattice of CsV3Sb5 displays complex effects, with unexpected double-peak behavior observed under high pressure conditions.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Kosuke Nakayama et al.
Summary: This study investigates the low-energy excitations of CsV3Sb5 and reveals strong CDW energy gaps associated with the Fermi surface and momentum, as well as energy gaps at the Dirac-crossing points, highlighting the importance of spin-orbit coupling.
Article
Materials Science, Multidisciplinary
Z. X. Wang et al.
Summary: Recent research on the kagome lattice metal AV(3)Sb(5) (A = K, Rb, Cs) family indicates the coexistence of superconductivity, charge density wave (CDW), and peculiar properties arising from a topological nontrivial electronic structure. The results suggest that the CDW order in this family is very different from a conventional CDW condensate, with the excited quasiparticle relaxation dynamics explained by the formation of a temperature-dependent energy gap below the phase transition.
Article
Materials Science, Multidisciplinary
Zhiwei Wang et al.
Summary: This study reports the observation of electronic chiral charge order in CsV3Sb5 using scanning tunneling microscopy (STM). The research reveals the unique electronic nature of the chiral charge order, as well as the formation of domain walls in the 1 x 4 superlattice, possibly as a surface effect. Additionally, clean-limit superconductivity is observed through vortex core bound states within the superconducting energy gap under a c-axis magnetic field.
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
Nana Shumiya et al.
Summary: The study reveals the presence of chiral charge order and nematic surface superlattices in the superconductor RbV3Sb5 with kagome lattices, showing interactions between them that can be tuned by a magnetic field. Defects can introduce standing waves which couple with the charge order to cause extrinsic effects.
Article
Materials Science, Multidisciplinary
Yu-Ping Lin et al.
Summary: The study investigates the interaction between real and imaginary charge density waves at the Van Hove singularity on hexagonal lattices. It reveals the formation of 3Q complex orders and the rich phase diagram they constitute. The theoretical model offers transparent interpretations of experimental observations in kagome metals and sheds light on the nature of topological charge density waves.
Article
Materials Science, Multidisciplinary
F. H. Yu et al.
Summary: A giant anomalous Hall effect (AHE) has been observed in kagome superconductor CsV3Sb5, with a conductivity reaching up to 2.1 x 10(4)Ω⁻¹ cm⁻¹, larger than most ferromagnetic metals. The emergence of AHE is strongly correlated with the higher-temperature charge-density-wave (CDW) transition, and AHE disappears when the CDW transition is completely suppressed under high pressure.
Article
Materials Science, Multidisciplinary
Feng Du et al.
Summary: The study on KV3Sb5 reveals that with increasing pressure, the charge order progressively weakens and the superconducting transition temperature undergoes different degrees of changes. A superconducting dome is formed at around 10 GPa, while a smaller superconducting dome emerges beyond 10 GPa.
Review
Physics, Applied
Jia-Xin Yin et al.
Summary: The search for topological phases of matter is moving towards strongly interacting systems like magnets and superconductors. Scanning tunnelling microscopy has become a powerful tool for probing and discovering emergent topological matter, with potential for providing new insights into topological matter at the atomic level in the future.
NATURE REVIEWS PHYSICS
(2021)
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MR Norman et al.
ADVANCES IN PHYSICS
(2005)
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ME Simon et al.
PHYSICAL REVIEW LETTERS
(2002)
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C Nayak
