Related references
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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
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
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
Materials Science, Multidisciplinary
J. Luo et al.
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).
NPJ QUANTUM MATERIALS
(2022)
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.
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
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
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
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
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
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
Physics, Multidisciplinary
Simone Fratini et al.
Summary: This study illustrates and characterizes the phenomenon of transient localization of current-carrying electrons in metals caused by scattering from slowly fluctuating degrees of freedom, leading the system away from normal metallic behavior. Strong interactions at metallic densities enhance electron localization and the emergence of a displaced Drude peak (DDP), altering low frequency optical response and suppressing d.c. conductivity. This phenomenon is commonly observed in electronic systems where slowly fluctuating degrees of freedom significantly couple to charge carriers.
Article
Materials Science, Multidisciplinary
Xilin Feng et al.
Summary: Motivated by recent experiments on AV(3)Sb(5) (A = K, Rb, Cs), a chiral flux phase has been proposed to explain time-reversal symmetry breaking. A low-energy effective theory based on van Hove points around the Fermi surface was constructed to understand the chiral flux phase, and the possible symmetry-breaking states on the kagome lattice were studied. The relations between low-energy symmetry breaking orders, chiral flux, and charge bond orders were discussed, and a total of 183 flux phases on the kagome lattice were found and classified by point-group symmetry.
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
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
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
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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NV Smith
