Related references
Note: Only part of the references are listed.
Article
Multidisciplinary Sciences
Z. Guguchia et al.
Summary: In this study, pressure-tuned and ultra-low temperature muon spin spectroscopy was used to uncover the unconventional nature of superconductivity in RbV3Sb5 and KV3Sb5. It was found that at ambient pressure, time-reversal symmetry breaking charge order was observed in RbV3Sb5, and the superconducting state displayed a nodal energy gap and reduced superfluid density. Applying pressure suppressed the charge-order transitions, increased the superfluid density, and progressively evolved the superconducting state from nodal to nodeless. The optimal superconductivity state was found to break time-reversal symmetry. These results offer unique insights into the nature of the pairing state and highlight the tunable nodal kagome superconductivity competing with time-reversal symmetry-breaking charge order.
NATURE COMMUNICATIONS
(2023)
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
Yigui Zhong et al.
Summary: In the study, it was found that the new kagome metal CsV3Sb5 may have superconductivity that intertwines with time-reversal and spatial symmetry-breaking orders, suggesting an unconventional pairing mechanism. Through angle-resolved photoemission spectroscopy and Eliashberg function analysis, an EPC strength of lambda=0.45-0.6 for both Sb 5p and V 3d electronic bands was determined, supporting the conventional superconducting transition temperature in CsV3Sb5. Additionally, the EPC on the V 3d-band was enhanced to lambda~0.75 as the superconducting transition temperature elevated to 4.4 K in Cs(V0.93Nb0.07)(3)Sb-5. These results provide important insights into the pairing mechanism in the kagome superconductor CsV3Sb5.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Shulun Han et al.
Summary: The recently discovered kagome topological superconductor AV(3)Sb(5) (A = K, Rb, Cs) has a unique structural motif that can host diverse topologically non-trivial phenomena. It remains unclear how atomic-level properties and many-body effects contribute to these symmetry-breaking phenomena. In this study, the role of V3d-Sb5p orbital hybridization in mediating the CDW phase transition in CsV3Sb5 is reported. The results highlight the critical role of Sb orbitals and establish orbital hybridization as the direct mediator of the CDW states and structural transition dynamics in kagome unconventional superconductors.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Linus Kautzsch et al.
Summary: The structural ground states and temperature-dependent evolution of the kagome superconductors KV3Sb5, RbV3Sb5, and CsV3Sb5 have been investigated. KV3Sb5 and RbV3Sb5 exhibit 2 x 2 x 2 superstructures with staggered trihexagonal deformation of vanadium layers in the Fmmm space group. CsV3Sb5 displays more complex structural evolution, with a staged progression of ordering into a 2 x 2 x 4 supercell exhibiting trihexagonal and Star of David patterns of deformations. Diffraction under pulsed magnetic fields suggests that the CDW state of CsV3Sb5 is insensitive to external magnetic fields.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Physics, Multidisciplinary
Hyeok-Jun Yang et al.
Summary: The nature of superconductivity in recently discovered kagome materials AV(3)Sb(5) (A = K, Rb, Cs) has been heavily debated. Recent experiments indicate the presence of orbital current order in addition to charge density wave (CDW) and superconductivity. This study investigates the mutual influence between orbital current order and superconductivity in kagome metals with characteristic van Hove singularity (vHS). By deriving the Landau-Ginzburg theory, possible orbital current orders and superconductivities are classified, leading to the expectation of distinct unconventional superconductivities depending on the type of orbital current ordering. This information can help infer the superconducting order parameter when identifying orbital current order and vice versa. Possible experiments to differentiate such coexisting superconducting states and orbital current order are also discussed.
SCIPOST PHYSICS CORE
(2023)
Article
Materials Science, Multidisciplinary
Tianchen Hu et al.
Summary: We have discovered that ScV6Sn6, a new intermetallic material with kagome lattice, undergoes a first-order structural phase transition at around 92K, forming a 3 x 3 x 3 charge density wave. Optical spectroscopy and band structure calculations revealed abrupt changes in optical reflectivity/conductivity spectra and band structure after the transition. This provides important insights into the origin of the structural phase transition in this unique kagome lattice intermetallic material.
Article
Physics, Multidisciplinary
Qian Xiao et al.
Summary: The recently discovered Kagome family AV3Sb5 (A = K, Rb, Cs) exhibits various physical phenomena, including non-trivial topological electronic structure, giant anomalous Hall effect, charge density waves (CDW) and superconductivity. In this study, we investigate the CDWs in CsV3Sb5 using x-ray scattering experiments and density-functional theory calculations, and demonstrate the coexistence of 2 x 2 x 2 and 2 x 2 x 4 CDW stacking phases. The competition between these CDW phases is revealed by tracking the temperature evolution of CDW intensities and different transition temperatures during warming-and cooling measurements. Additionally, a meta-stable quenched state of CsV3Sb5 is identified after fast-cooling process. Our study provides insights into the properties of CsV3Sb5 and the coexistence of competing CDW stackings in this system.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Jin-Wei Dong et al.
Summary: Recent experiments have found evidence for possible spontaneous time-reversal symmetry (TRS) breaking in the charge density wave (CDW) ordered state of vanadium-based nonmagnetic kagome metals AV3Sb5 (A = K, Rb, Cs). The emergence of loop currents has been suggested as a candidate for the TRS breaking state, but a microscopic model for this phenomenon is still lacking. In this study, the susceptibility of real and imaginary bond orders on the kagome lattice is calculated, and the importance of next-nearest-neighbor Coulomb repulsion V2 in triggering the instability toward imaginary bond ordered CDW is revealed. Furthermore, a concrete effective model on the kagome lattice is studied, providing insights into the ground states, properties, and phase diagram in relation to the values of V1 and V2 at van Hove filling. The research also extends these results to include electron doping, showcasing the stabilization of loop currents and the emergence of doped orbital Chern insulators with significant Berry curvature and orbital magnetic moment.
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
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.
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
Materials Science, Multidisciplinary
Alaska Subedi
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.
PHYSICAL REVIEW MATERIALS
(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
Physics, Multidisciplinary
Yutao Jiang et al.
Summary: This study expands the variety of CsV3Sb5-like materials and identifies 28 promising candidates. These compounds exhibit unique electronic structures and can be categorized into non-magnetic and magnetic groups.
CHINESE PHYSICS LETTERS
(2022)
Article
Physics, Multidisciplinary
DianWu Song et al.
Summary: This study reveals the nature of density-wave-like transition in vanadium-based kagome superconductors through nuclear magnetic resonance measurements. It confirms the presence of a first-order structural transition and a three-dimensional structural modulation. The study suggests that the orbital order is the primary electronic order induced by the structural transition and provides evidence for possible orbital fluctuations.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Article
Multidisciplinary Sciences
Rina Tazai et al.
Summary: This article investigates exotic quantum phase transitions in metals and specifically explores the unconventional density-wave order in geometrically frustrated kagome metals and its relationship with superconductivity. The study reveals that the density wave in kagome metals is a bond order, and the significant intersite attraction is caused by quantum interference among paramagnons. Additionally, moderate bond order fluctuations mediate sizable pairing glue, resulting in both singlet s-wave and triplet p-wave superconductivity. The article also provides an explanation for characteristic pressure-induced phase transitions in CsV3Cb5.
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
Multidisciplinary Sciences
Lixuan Zheng et al.
Summary: The discovery of electronic orders in kagome superconductors AV(3)Sb(5) opens up a promising avenue for exploring new emergent physics. Pressure experiments on CsV(3)Sb(5) reveal a new CDW phase between P-c1 ≈ 0.58 GPa and P-c2 ≈ 2.0 GPa, attributed to a possible stripe-like CDW order, explaining the two-dome-like superconducting behavior under pressure. Additionally, nuclear spin-lattice relaxation measurements show evidence for pressure-independent charge fluctuations above the CDW transition temperature and unconventional superconducting pairing above P-c2.
Article
Physics, Multidisciplinary
Anna E. Boehmer et al.
Summary: Electronic nematicity, the spontaneous reduction of rotational symmetry in a crystalline solid driven by an electronic mechanism, is an important phenomenon. Iron-based superconductors provide an ideal material platform for studying this phenomenon, and their nematic phase can be studied using a variety of experimental techniques. The understanding of nematicity is crucial for understanding superconducting pairing and normal-state properties.
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
Physics, Multidisciplinary
Hasitha W. Suriya Arachchige et al.
Summary: Stacked vanadium kagome layers in AV(3)Sb(5) compounds have been found to exhibit unusual charge density waves. In this study, a different charge density wave phenomenon is observed in ScV6Sn6, offering further opportunities to explore density wave order in kagome lattice materials.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Sen Zhou et al.
Summary: The recent discovery of novel charge density wave (CDW) and pair density wave (PDW) in kagome lattice superconductors AV(3)Sb(5) suggests the presence of unexpected time-reversal symmetry breaking correlated and topological states. The authors propose that the metallic CDW state with circulating loop currents is a doped orbital Chern insulator near van Hove filling, leading to the emergence of various correlated and topological states.
NATURE COMMUNICATIONS
(2022)
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
Chunyu Guo et al.
Summary: This study reports the observation of chiral transport in the centrosymmetric layered kagome metal CsV3Sb5 via second-harmonic generation. The chirality is induced by the out-of-plane component of the magnetic field and can be switched from left-handed transport to right-handed transport by changing the field sign. CsV3Sb5 is the first material in which strong chiral transport can be controlled and switched by small magnetic field changes.
Article
Multidisciplinary Sciences
Xiaokun Teng et al.
Summary: A hallmark of strongly correlated quantum materials is the rich phase diagram resulting from competing and intertwined phases. Recently, such rich phase diagrams have also been shown in correlated topological materials. This study reports the discovery of CDW in the antiferromagnetic ordered phase of kagome lattice FeGe, which is caused by the combination of electron-correlated AFM order and van Hove singularities-driven instability.
Article
Physics, Multidisciplinary
M. Ikhlast et al.
Summary: Piezomagnetism is a linear coupling between strain and magnetic order, enabling the control of magnetization. This study reports the observation of large piezomagnetism at room temperature in an antiferromagnetic Weyl semimetal, which allows strain to control the anomalous Hall effect. This finding has the potential for spintronics applications.
Article
Physics, Multidisciplinary
Jia-Xin Yin et al.
Summary: This study explores the charge order in the kagome lattice of FeGe through tunneling, revealing a 2 x 2 charge order and uncovering its correlation with antiferromagnetism and charge order anisotropy. Additionally, the study detects a pronounced edge state within the charge order energy gap.
PHYSICAL REVIEW LETTERS
(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
Xin-Wei Yi et al.
Summary: A group of recently discovered nonmagnetic metal kagome structures AV3Sb5 (A = K, Rb, Cs) have attracted widespread interest due to their unusual charge density wave and intertwined superconductivity. High-throughput first-principles calculations have identified 24 dynamically stable kagome metals with stronger electron-phonon coupling and higher superconducting transition temperatures than the reported AV3Sb5 materials. Several compounds have also been identified as Z2 topological metals with clear Dirac cone topological surface states. This research provides a rich platform for exploring various physics and offers promising insights for the discovery of topological superconductors.
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
Morten H. Christensen et al.
Summary: This study investigates the complex charge-ordered states in AV3Sb5, a recently discovered vanadium-based kagome metal. The results show the existence of mixed imaginary charge density wave (iCDW) and real charge density wave (rCDW) configurations, as well as different types of iCDW orders. These charge-ordered states exhibit various types of uniform magnetic orders and unique magnetostriction, magnetoelectric, and magnetoelectrostriction properties. Experimental probing can identify the specific iCDW state present in these compounds.
Article
Materials Science, Multidisciplinary
Sayak Dasgupta
Summary: This study investigates the effect of strain on the strong anomalous Hall response in the kagome lattice antiferromagnet Mn3Ge. It reveals that both intraplanar and interplanar strains can switch the sign of the Hall response at a constant magnetic field. Furthermore, strain can effectively manipulate the spin-wave band gaps, providing a way to tune the magnon responses in this system.
Article
Materials Science, Multidisciplinary
Francesco Ferrari et al.
Summary: This study investigates the ground state properties of the Hubbard model on the kagome lattice with both on-site U and nearest-neighbor V Coulomb repulsion at van Hove filling. The results reveal the presence of different interaction-driven charge density waves (CDWs) and the absence of ferromagnetism and charge or spin-bond order. The CDWs triggered by the nearest-neighbor repulsion have charge disproportionations that are not in line with experimental observations in AV3Sb5. Additionally, electron-phonon interaction is considered as an alternative mechanism to stabilize charge-bond order, leading to findings that are closer to experimental results.
Article
Physics, Multidisciplinary
Rustem Khasanov et al.
Summary: The recently discovered vanadium-based kagome metals AV(3)Sb(5) exhibit superconductivity at low temperatures and charge density wave (CDW) order at high temperatures. In this study, the signatures of time-reversal symmetry breaking in the charge order of CsV3Sb5 were investigated using muon-spin rotation/relaxation techniques. The results showed enhanced electronic response below 30 K and a field-induced enhancement of the response at the CDW transition.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Andrzej Ptok et al.
Summary: Systems containing the ideal kagome lattice can exhibit distinct exotic states of matter, such as the coexistence of charge density wave (CDW) and superconductivity observed in the AV(3)Sb(5) compounds. This paper investigates the dynamic properties and charge distribution of the AV(3)Sb(5) systems to understand the origin of the CDW phase. The study reveals that CDW is a consequence of atom displacement from the high-symmetry position of the kagome net and the surface modulation is related to the three-dimensional 2x 2x 2 bulk CDW. Additionally, the realization of the C2/m structure affects the electronic properties in accordance with experimental data.
Article
Materials Science, Multidisciplinary
Florian Theuss et al.
Summary: In this study, we measure the full elastic tensors of Mn3Ge and Mn3Sn as a function of temperature and find strong magnetoelastic coupling in their respective antiferromagnetic phase transitions. The discontinuities in bulk moduli at the N??el transitions are significantly larger in Mn3Ge than in Mn3Sn, and we calculate the pressure derivatives of the N??el temperature based on the magnitudes of the discontinuities. Additionally, we measure the in-plane shear modulus in both compounds under different magnetic fields and observe similar behavior. Recent experiments have shown strong piezomagnetism in Mn3Sn, and our results suggest that Mn3Ge may be an even better candidate for this effect.
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
Armando Consiglio et al.
Summary: In this study, the structural and electronic properties of kagome metals AV(3)Sb(5) (A = Cs, K, Rb) under isotropic and anisotropic pressure were investigated using first-principles calculations. The results show that the charge-ordering patterns are suppressed and there is a significant rearrangement of Van Hove point energies. The findings suggest a mechanism for tuning the correlation profile in kagome metals and provide insights for further experimental investigations on unconventional pairing and multidome superconductivity.
Article
Materials Science, Multidisciplinary
Huazhou Li et al.
Summary: Compounds with kagome lattice exhibit exotic quantum states and unconventional charge density wave states. Anomalous Hall effect suggests the presence of chiral flux current states. Scanning tunneling measurements confirm different ordered structures but do not observe the chiral flux current phase.
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
Materials Science, Multidisciplinary
Jian-Guo Si et al.
Summary: The origin of the charge density wave (CDW) order and the superconducting properties of CsV3Sb5 under pressure are studied using first-principles calculations. The momentum-dependent electron-phonon coupling effect is found to play an important role in the formation of CDW order, and the experimentally observed double superconducting domes can be explained by the movement of the van Hove singularity and the redistribution of the electron-phonon coupling. The main contribution to the electron-phonon coupling shifts from in-plane vibrational modes to out-of-plane modes with increasing pressure.
Article
Physics, Multidisciplinary
S. Benhabib et al.
Summary: Ultrasound experiments show that the superconducting order parameter in strontium ruthenate must have two components. The nature of its superconducting order parameter is still under debate. The observed sharp jump in the shear elastic constant directly implies the superconducting order parameter is of a two-component nature.
Article
Physics, Multidisciplinary
Sayak Ghosh et al.
Summary: Sr2RuO4 has been considered the leading candidate for a spin-triplet superconductor for 26 years, but recent experiments have raised doubts. Observations of a thermodynamic discontinuity in the shear elastic modulus suggest a two-component superconducting order parameter. Therefore, two other two-component order parameters are now seen as the prime candidates for the order parameter of Sr2RuO4.
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, Condensed Matter
Eric M. Kenney et al.
Summary: Muon spin relaxation and rotation measurements on the newly discovered kagome metal KV3Sb5 reveal a local field dominated by weak magnetic disorder associated with nuclear moments and showing a modest temperature dependence consistent with bulk magnetic susceptibility. The absence of evidence for V4+ local moments suggests that further studies are needed to understand the physics underlying the recently reported giant unconventional anomalous Hall effect in this material.
JOURNAL OF PHYSICS-CONDENSED MATTER
(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
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)
Review
Physics, Multidisciplinary
Alberto de la Torre et al.
Summary: Recent progress in utilizing ultrafast light-matter interaction to control the macroscopic properties of quantum materials is reviewed, focusing on photoinduced phenomena that are nonthermal in nature. These phenomena involve transient modifications to the free energy landscape, redistribution of quasiparticle populations, modification of coupling strengths, resonant driving of the crystal lattice, and coherent dressing of a material's quantum states by the light field. Discussing recently discovered effects leveraging these mechanisms and presenting a road map for utilizing nonthermal pathways to create new functionalities.
REVIEWS OF MODERN PHYSICS
(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
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
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
Chao Mu et al.
Summary: CsV3Sb5 exhibits s-wave superconducting behavior at low temperatures, with superconductivity emerging in the charge order state. Split V-51 NMR spectra and Sb-121/123 NQR spectra were observed after the charge density wave, indicating a commensurate CDW state.
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
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
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
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.
Article
Materials Science, Multidisciplinary
H. Miao et al.
Summary: The Kagome lattice is a rich platform for studying topological and intertwined electronic excitations, with recent experimental evidence of an unconventional charge density wave in AV(3)Sb(5) triggering interest in the interplay between frustrated crystal structures and Fermi surface instabilities. Analysis of lattice effects in AV(3)Sb(5) shows that the 2x2x2 CDW breaks the crystal's sixfold rotational symmetry and explains the observed CDW peak intensity, emphasizing the fundamental role of lattice geometry in understanding unconventional electronic orders. The coupling between lattice and electronic degrees of freedom leads to a weak first-order structural transition without continuous changes in lattice dynamics.
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
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.
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.
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
Multidisciplinary Sciences
Sayak Ghosh et al.
Article
Multidisciplinary Sciences
Shuo-Ying Yang et al.
Article
Multidisciplinary Sciences
Rafael M. Fernandes et al.
Article
Physics, Multidisciplinary
Brenden R. Ortiz et al.
PHYSICAL REVIEW LETTERS
(2020)
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Physics, Multidisciplinary
F. Grandi et al.
PHYSICAL REVIEW RESEARCH
(2020)
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Materials Science, Multidisciplinary
Manuel Fernandez Lopez et al.
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Physics, Multidisciplinary
M. Claassen et al.
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Materials Science, Multidisciplinary
Brenden R. Ortiz et al.
PHYSICAL REVIEW MATERIALS
(2019)
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Materials Science, Multidisciplinary
J. W. F. Venderbos
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Materials Science, Multidisciplinary
Wan-Sheng Wang et al.
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Physics, Multidisciplinary
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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Physics, Multidisciplinary
Jasper van Wezel
Review
Physics, Condensed Matter
K. Rossnagel
JOURNAL OF PHYSICS-CONDENSED MATTER
(2011)
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Physics, Multidisciplinary
Rafael M. Fernandes et al.
PHYSICAL REVIEW LETTERS
(2011)
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Materials Science, Multidisciplinary
Qin Liu et al.
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Materials Science, Multidisciplinary
Jun Wen et al.
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Materials Science, Multidisciplinary
M. D. Johannes et al.
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Physics, Multidisciplinary
M Sigrist
PROGRESS OF THEORETICAL PHYSICS
(2002)
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Materials Science, Multidisciplinary
C Nayak
