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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
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
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
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
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
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
Computer Science, Interdisciplinary Applications
Vei Wang et al.
Summary: VASPKIT is a command-line program that provides a robust and user-friendly interface for high-throughput analysis of material properties. It consists of pre-and post-processing modules, can run on different platforms, and offers rich functionalities and a user-friendly interface.
COMPUTER PHYSICS COMMUNICATIONS
(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
Physics, Multidisciplinary
Wei Jiang et al.
Summary: A novel approach to achieve a giant anomalous Hall effect in materials with flat bands by decreasing electronic bandwidth to increase momentum separation is proposed. This approach can be realized experimentally through strain engineering in pyrochlore and spinel compounds.
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
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
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
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
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
Materials Science, Multidisciplinary
Riccardo Ciola et al.
Summary: Research on kagome metals reveals the possibility of chiral symmetry breaking, with a dimerization pattern identified as the leading instability causing excitation gap opening at the Dirac point and breaking chiral symmetry. Through a lattice model analysis, the critical coupling strength and ordering pattern were determined, shedding light on the unique characteristics of kagome metals.
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
Jian-Feng Zhang et al.
Summary: Using first-principles calculations, we studied the CDW state, superconductivity, and topological properties in CsV3Sb5 under pressures. Our results suggest that the superconductivity and magnetism in CsV3Sb5 vary under different pressure conditions.
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
Physics, Multidisciplinary
N. N. Wang et al.
Summary: The study reveals a strong competition between CDW order and superconductivity in RbV3Sb5, with CDW order experiencing subtle modifications at approximately 1.5 GPa before being completely suppressed around 2.4 GPa. This competition leads to a shallow M-shaped double superconducting dome in the superconducting transition of the material.
PHYSICAL REVIEW RESEARCH
(2021)
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
Jianzhou Zhao et al.
Summary: Recent studies have revealed fascinating physics in AV(3)Sb(5) materials, including charge density wave and superconducting states. Research on the KV3Sb5 family materials showed that they are good metals with weak local correlations. The findings suggest that the local correlation strength in these materials may be too weak to generate unconventional superconductivity.
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.
Article
Physics, Multidisciplinary
Brenden R. Ortiz et al.
PHYSICAL REVIEW LETTERS
(2020)
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Materials Science, Multidisciplinary
Brenden R. Ortiz et al.
PHYSICAL REVIEW MATERIALS
(2019)
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S. L. Skornyakov et al.
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Alexander Steppke et al.
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Wan-Sheng Wang et al.
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Maximilian L. Kiesel et al.
PHYSICAL REVIEW LETTERS
(2013)
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Materials Science, Multidisciplinary
Maximilian L. Kiesel et al.
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Wing-Ho Ko et al.
Software Review
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Koichi Momma et al.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2008)
