Related references
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Article
Multidisciplinary Sciences
Sun-Woo Kim et al.
Summary: Recently, layered kagome metals AV(3)Sb(5) have attracted attention for their unique properties and potential for designer quantum phases. In this study, the authors explore the mono-layered form of AV(3)Sb(5) and demonstrate its different symmetries compared to the three-dimensional bulk. They predict the presence of enriched van Hove singularities, leading to various competing instabilities such as charge density waves and superconductivity. These findings highlight the monolayer kagome metal as a promising platform for further investigation and potential applications in quantum materials.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Xinjian Wei et al.
Summary: This study reports the observation of LMR in layered kagome superconductor and CDW material, as well as the dimensional and temperature crossovers of such LMR. The possible origin of the LMR is attributed to two-dimensional CDW fluctuations. These findings provide a new perspective for understanding the interactions between competing orders in kagome superconductors.
Review
Multidisciplinary Sciences
Kun Jiang et al.
Summary: This review discusses the recent progress on the experimental and theoretical studies of kagome superconductors AV(3)Sb(5), including the electronic properties, charge density wave state, time-reversal symmetry breaking, and superconducting properties. The authors aim to stimulate an expanded search for unconventional kagome superconductors.
NATIONAL SCIENCE REVIEW
(2023)
Article
Multidisciplinary Sciences
Linpeng Nie et al.
Summary: This study presents evidence for the existence of electronic nematicity in CsV3Sb5, providing new insights into the pairing mechanism in unconventional superconductors.
Article
Multidisciplinary Sciences
C. Mielke et al.
Summary: The kagome lattice is a prominent structural motif in quantum physics that can host diverse quantum phases. Recent studies have shown that kagome superconductors exhibit unconventional chiral charge order, but direct evidence for time-reversal symmetry breaking is still lacking. Using muon spin relaxation, we observed an enhancement of the internal field width below the charge ordering temperature in KV3Sb5, indicating the presence of time-reversal symmetry-breaking charge order intertwining with unconventional superconductivity.
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
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
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
Multidisciplinary Sciences
Yong Hu et al.
Summary: Enhanced correlation effects due to multiple van Hove singularities (VHS) in the vicinity of the Fermi level are predicted in the recently discovered AV(3)Sb(5) kagome metals. This study identifies three VHSs with diverse sublattice characters in CsV3Sb5, and reveals the flat dispersion of one VHS, suggesting its higher-order nature. The insights into the electronic structure provided by this work serve as a solid starting point for understanding the intriguing correlation phenomena in the kagome metals AV(3)Sb(5).
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Yuzki M. Oey et al.
Summary: The unconventional coupling between CDW and superconducting states in CsV3Sb5-xSnx materials was studied. With hole doping, superconductivity shows a nonmonotonic evolution, while the CDW order is rapidly suppressed.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Physics, Multidisciplinary
Yishuai Xu et al.
Summary: Understanding the interplay between superconductivity, time-reversal symmetry breaking, and charge order in kagome materials is crucial. Optical measurements reveal that spatial and time-reversal symmetries are broken at the onset of charge order. Kagome lattice offers a fascinating playground for studying geometrical frustration, topology, and strong correlations. Newly discovered kagome metals exhibit topological band structure, symmetry-breaking charge-density waves, and superconductivity. However, the nature of symmetry breaking in the charge-density wave phase is still unclear.
Article
Multidisciplinary Sciences
Gan Liu et al.
Summary: Unusual large-frequency collective lattice excitations, known as amplitude modes, are observed in CsV3Sb5, a Kagome metal, in the absence of phonon softening, providing evidence of strong electron-phonon coupling.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Haoxiang Li et al.
Summary: In this study, the coexistence of the 2 x 2 x 1 charge density wave in the kagome sublattice and the Sb 5p-electron assisted 2 x 2 x 2 charge density waves in CsV3Sb5 is reported. The influence of pressure on CDW transition temperatures is also observed.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Qiong Wu et al.
Summary: This study reports the observation of twofold rotation symmetry in the CDW state of the newly discovered kagome superconductor CsV3Sb5. The observed polarization rotation is different from other experimental methods and suggests the possible existence of TRSB and nematicity. The use of femtosecond laser pulse pumping and coherent phonon allows for the control of nematicity in the CDW state.
Article
Materials Science, Multidisciplinary
Yong Hu et al.
Summary: The recently discovered AV3Sb5 metals have attracted attention for their unique combination of superconductivity, charge density wave order, and nontrivial band topology. Despite intensive research efforts, the nature of the charge density wave order in these metals remains elusive. In this study, the electronic structure of AV3Sb5 is investigated using angle-resolved photoemission spectroscopy and density-functional theory calculations. The results provide insights into the dimensionality and pattern of the charge density wave order and its effects on the electronic structure, contributing to a better understanding of the exotic properties in these metals.
Article
Materials Science, Multidisciplinary
Q. Stahl et al.
Summary: In this study, we investigated the electronic ordering instabilities of CsV3Sb5 using x-ray diffraction. We observed unexpected reorganization of the electronic order as a function of temperature, which has a significant impact on the transport properties and coincides with anomalies observed in magnetotransport measurements. Furthermore, we found that the electronic order breaks the symmetry of the underlying lattice. These findings are crucial for understanding the physical properties of CsV3Sb5.
Article
Materials Science, Multidisciplinary
Yongkai Li et al.
Summary: The coexistence of superconductivity and charge-density wave (CDW) order in kagome systems has sparked great interest. In this study, Cs(V1-xNbx)3Sb5 samples with systematic Nb doping were extensively investigated, and it was found that Nb doping leads to the suppression of CDW order and the promotion of superconductivity. Additionally, the anomalous Hall effect (AHE) and magnetoresistance (MR) were significantly weakened along with the CDW order. The effects were interpreted through density-functional calculations and antiphase shifts of the Fermi energy near saddle points and a Fermi surface reorganization. The results uncovered a delicate and unusual competition between CDW order and superconductivity.
Article
Materials Science, Multidisciplinary
Shangfei Wu et al.
Summary: In this study, polarization-resolved electronic Raman spectroscopy and density functional theory are used to investigate the primary and secondary order parameters, as well as their interplay, in the charge density wave state of the kagome metal AV(3)Sb(5). The results reveal that the U-1 lattice distortion is the primarylike order parameter for vanadium displacements, while M-1(+) and L-2(-) distortions are secondarylike order parameters. Additionally, several phonon modes related to lattice vibrations are identified in the CDW state.
Article
Materials Science, Multidisciplinary
Yaofeng Xie et al.
Summary: Metallic materials with kagome lattice structure have attracted significant attention due to their unique electronic properties and potential applications in unconventional superconductors. Recent research has found intertwined charge density wave (CDW) order and superconductivity in AV3Sb5 compounds. Neutron scattering experiments reveal that the CDW order in CsV3Sb5 is associated with static lattice distortion and electron-phonon coupling.
Article
Materials Science, Multidisciplinary
C. C. Zhu et al.
Summary: We conducted high-pressure resistance measurements on V-based superconductors AV3Sb5 and discovered that they exhibit double-dome superconductivity. The strength and behavior of the superconducting domes are influenced by the ionic radius of the intercalated alkali-metal atoms.
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, 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
Yanpeng Song et al.
Summary: This study explores the effects of hole doping on superconductivity and charge density wave (CDW) order in layered kagome metals AV3Sb5. The enhancement of superconducting properties and suppression of CDW were observed in thin flakes compared to bulk samples, indicating the crucial role of van Hove singularities in promoting correlated quantum states. The findings suggest a novel approach to tune carrier concentration in CsV3Sb5, providing a tunable 2D platform for further exploration of topology and correlation in kagome lattices.
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
Multidisciplinary Sciences
Ying Xiang et al.
Summary: The authors report the two-fold rotational symmetry of superconductivity and signatures of an in-plane nematic electronic state in CsV3Sb5 under in-plane magnetic field. Interestingly, the two orders of superconductivity and nematic electronic state are orthogonal to each other in terms of the field direction of the minimum resistivity, shedding new light on understanding the physical properties of CsV3Sb5.
NATURE COMMUNICATIONS
(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
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
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
Xu Chen et al.
Summary: This study demonstrates the superconducting performance and high robustness of structural stability of kagome CsV3Sb5 under high pressures, revealing the variation of Tc under different pressures. Changes in electronic structure and electron-phonon coupling may be responsible for the pressure-induced reentrant superconductivity.
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)
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Materials Science, Multidisciplinary
Takamori Park et al.
Summary: Electronic instabilities of a kagome metal with Fermi energy close to saddle points at the hexagonal Brillouin zone face centers were studied using parquet renormalization group, which determined superconducting, charge, orbital moment, and spin density waves. Landau theory was then applied to discuss how different primary density wave orders result in charge density wave modulations.
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.
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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.
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Materials Science, Multidisciplinary
Zhuyi Zhang et al.
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