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Summary: The authors use high-resolution angle-resolved photoemission spectroscopy to determine the microscopic structure of three-dimensional charge order in AV(3)Sb(5) (A = K, Rb, Cs) and its interplay with superconductivity. The observed difference in charge order structure between CsV3Sb5 and the other compounds potentially explains the double-dome superconductivity in CsV3(Sb,Sn)(5) and the suppression of T-c in KV3Sb5 and RbV3Sb5. These findings provide fresh insights into the phase diagram of AV(3)Sb(5).
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Summary: The recently discovered vanadium-based Kagome metals AV3Sb5 exhibit a unique phase transition into charge-density wave (CDW) order that occurs before unconventional superconductivity and time-reversal symmetry breaking. To understand the role of CDW in establishing these unconventional phases, it is crucial to unveil the symmetries and microscopic nature of the charge-ordered phase. In this study, the exact structure of the charge-density wave ordering temperature (TCDW) below RbV3Sb5 is determined through a comprehensive set of nuclear magnetic resonance (NMR) measurements and density functional theory simulations. The findings provide important guidance for developing a theoretical framework to predict properties of exotic electronic orders within the CDW phase.
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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.
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Summary: In this study, the charge density wave states of kagome metals KV3Sb5, RbV3Sb5, and CsV3Sb5 were investigated using first-principles calculations. By group-theoretical analysis and structural relaxations, it was found that the F mmm phase has the lowest energy in all three compounds, with a characteristic instability leading to a base-centered-orthorhombic structure. The absence of mirror symmetry perpendicular to the b axis in individual kagome layers, if observed below the structural transition temperature, would provide strong evidence for the Cmcm structure describing the charge density wave states of these materials.
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Summary: In this study, the CDW order structure in the kagome superconductor CsV3Sb5 is investigated. It is found that the CDW order is of the first order, commensurate, and exhibits a star-of-David pattern. The experimental results provide new insights into AV(3)Sb(5).
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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.
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Jordan Venderley et al.
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PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
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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
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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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Morten H. Christensen et al.
Summary: In this study, a phenomenological Landau model for the charge density wave (CDW) state in metallic Kagome compounds AV(3)Sb(5) (A = K, Rb, Cs) was derived and solved using group theory and density functional theory (DFT). The results revealed an electronically driven CDW phase with unstable phonon modes depending on electronic temperature, leading to a new understanding of the superconducting ground state. Additionally, the study identified unusual trilinear terms and coupled multi-Q CDW orders, offering insights into the leading instabilities of the system such as staggered trihexagonal and staggered Star of David phases.
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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.
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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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