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Article
Physics, Multidisciplinary
Feng Du et al.
Summary: This study reveals that applying moderate pressure can suppress charge order and enhance the superconducting transition temperature, but further increasing pressure weakens the transition temperature. The presence of a second superconducting dome is also observed, which is linked to high-pressure resistance anomalies.
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
Rui Lou et al.
Summary: The entanglement of charge density wave (CDW), superconductivity, and topologically nontrivial electronic structure has been discovered in the kagome metal AV3Sb5 (A = K, Rb, Cs) family recently. Using high-resolution angle-resolved photoemission spectroscopy, the electronic properties of CDW and superconductivity in CsV3Sb5 are studied. The spectra around K over line exhibit a peak-dip-hump structure associated with two separate branches of dispersion, indicating the isotropic CDW gap opening below EF. The presence of a superconducting gap on both the electron band around Gamma over line and the flat band around K suggests multiband superconductivity. Our results shed light on the controversial origin of the CDW and provide insights into the relationship between CDW and superconductivity.
PHYSICAL REVIEW LETTERS
(2022)
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
Physics, Multidisciplinary
Kosuke Nakayama et al.
Summary: Successful electron doping to CsV3Sb5 by Cs dosing has been achieved, and the electron filling of the Sb 5p(z) and V 3d(xz/yz) bands can be selectively increased while suppressing the CDW. This result reveals the crucial role of multiorbital effect in CDW and superconductivity.
Article
Instruments & Instrumentation
Miho Kitamura et al.
Summary: Micro-angle-resolved photoemission spectroscopy is a powerful tool for elucidating key electronic states of exotic quantum materials, and the system developed in this study, based on Kirkpatrick-Baez mirror optics, enables accurate spatially resolved band-structure mapping.
REVIEW OF SCIENTIFIC INSTRUMENTS
(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
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
Takemi Kato et al.
Summary: In this study, the structural distortion responsible for the charge density wave in KV3Sb5 is investigated using angle-resolved photoemission spectroscopy and first-principles calculations, providing microscopic insight into the charge density wave and superconducting mechanisms.
COMMUNICATIONS MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Chongze Wang et al.
Summary: Using first-principles calculations, the origin of the observed charge density wave (CDW) formation in a layered kagome metal CsV3Sb5 is identified. The structural distortion of the kagome lattice accompanies the stabilization of quasimolecular states, resulting in the opening of CDW gaps. Applied hydrostatic pressure destabilizes the quasimolecular states and leads to the disappearance of the CDW phase.
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
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
Yang Fu et al.
Summary: The transport properties of kagome superconductor CsV3Sb5 were studied at magnetic fields up to 32 T, revealing Shubnikov-de Haas oscillations and cyclotron masses at different frequencies. The close Berry phases of certain frequencies provide evidence of the nontrivial topological band structures of CsV3Sb5, confirming the Fermi surfaces near the Brillouin zone boundary and a stable structure at the charge density wave state. These results shed light on the nature of correlated topological physics in kagome material CsV3Sb5.
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
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
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
Zuowei Liang et al.
Summary: Transition-metal-based kagome metals offer a versatile platform for correlated topological phases with various electronic instabilities. The study of a newly discovered Z(2) topological kagome metal CsV3Sb5 with a superconducting ground state reveals charge modulation associated with the opening of an energy gap near the Fermi level. The findings suggest CsV3Sb5 as a promising candidate for realizing exotic excitations at the intersection of nontrivial lattice geometry, topology, and multiple electronic orders.
Article
Physics, Multidisciplinary
Haoxiang Li et al.
Summary: The study reveals the existence of a three-dimensional CDW in (Rb, Cs)V3Sb5 with a 2 x 2 x 2 superstructure. The CDW does not induce phonon anomalies at the CDW wave vector, but results in a novel Raman mode that quickly dampens into a broad continuum.
Article
Materials Science, Multidisciplinary
Harrison LaBollita et al.
Summary: The electronic structure of the new family of kagome metals AV(3)Sb(5) can be modified by pressure and hole doping, with pressure shifting saddle points away from the Fermi level and doping bringing them closer. This demonstrates how pressure and doping can be used to tune Fermi surface instabilities and associated orders.
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
Tiema Qian et al.
Summary: This paper investigates the effect of uniaxial strains along the crystalline a axis on the kagome superconductor CsV3Sb5, revealing a strong competition between the superconducting transition temperature Tc and the charge-density wave transition temperature T-CDW. The study shows that Tc monotonically increases with increasing strain while T-CDW decreases, highlighting the importance of the c-axis lattice parameter as a tuning knob for the phase diagram of CsV3Sb5.
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
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
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
Xiaoxiang Zhou et al.
Summary: This study investigates the optical properties of CsV3Sb5 at various temperatures above and below the charge-density-wave transition. The presence of multiple Drude components is observed in the low-frequency optical conductivity above the CDW transition, with distinct origins attributed to different bands in the band structure. The opening of the CDW gap affects the broad Drude component significantly while leaving the narrow Drude component unaffected, highlighting the importance of saddle point nesting in driving the CDW instability in CsV3Sb5.
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.
Article
Materials Science, Multidisciplinary
Zhuyi Zhang et al.
Summary: This study reports pressure-induced reemergence of superconductivity in CsV3Sb5, where the superconducting critical temperature initially increases and then decreases with pressure, forming a dome-shaped superconducting phase diagram. A new superconducting state emerges with further compression above 16.5 GPa, with T-c reaching a second maximum around 5.0 K and remaining stable up to 47.9 GPa. The reemergence of superconductivity in V-based superconductor is suggested to be attributed to a pressure-induced Lifshitz transition, supported by high-pressure synchrotron x-ray-diffraction measurements showing the stability of the pristine hexagonal phase up to 43.1 GPa.
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