Order-disorder Peierls instability in the kagome metal (Cs,Rb)V${}_3$Sb${}_5$

Abstract

The nature of the charge density wave phases in the kagome metal compound AV${}_3$Sb${}_5$ has raised many questions and their origin is still under debate. Here, we combine diffuse scattering (DS) and inelastic x-ray scattering (IXS) to identify a 3-dimensional (3D) precursor of the charge order with propagation vector (0.5 0 0.5), which condenses into a 3D-CDW through a first order phase transition. The quasi-elastic critical scattering indicates that the dominant contribution to the diffuse precursor is the elastic central peak without phonon softening. However, the inelastic spectra show a small broadening of the Einstein-type phonon mode on approaching the phase transition. Our results point to the situation where the Fermi surface instability at the \textit{L} point is of order-disorder type with a critical growth of quasi-static domains. The results go beyond the classical weak-coupling Peierls transition dynamics and are discussed within models including strong-electron phonon coupling and non-adiabaticity.

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Cited by in corpus (31)

• AV${}_3$Sb${}_5$ Kagome Superconductors: Progress and Future Directions
• Softening of a flat phonon mode in the kagome ScV${}_6$Sn${}_6$
• Competing charge-density wave instabilities in the kagome metal ScV${}_6$Sn${}_6$
• Charge fluctuations above $T_{\mathrm{CDW}}$ revealed by glasslike thermal transport in kagome metals $A$V${}_3$Sb${}_5$ ($A$ = K, Rb, Cs)
• Annealing-induced long-range charge density wave order in magnetic kagome FeGe: fluctuations and disordered structure
• The kagome Hubbard model from a functional renormalization group perspective
• $\pi$ Phase Interlayer Shift and Stacking Fault in the Kagome Superconductor CsV${}_3$Sb${}_5$
• Pressure-dependent Electronic Superlattice in the Kagome-Superconductor CsV${}_3$Sb${}_5$
• FeGe as a building block for the kagome 1:1, 1:6:6, and 1:3:5 families: hidden d-orbital decoupling of flat band sectors, effective models and interaction Hamiltonians
• Kagome metals
• Phonon collapse and anharmonic melting of the 3D charge-density wave in kagome metals
• Glass-like Cross-plane Thermal Conductivity of Kagome Metals RbV3Sb5 and CsV3Sb5
• Precursor phase with full phonon softening above the charge-density-wave phase transition in $2H$-TaSe${}_2$
• Frustrated charge density wave and quasi-long-range bond-orientational order in the magnetic kagome FeGe
• Dynamical decoding of the competition between charge density waves in a kagome superconductor
• Kagome KMn${}_3$Sb${}_5$ metal: Magnetism, lattice dynamics, and anomalous Hall conductivity
• Revealing Rotational Symmetry Breaking Charge-density Wave Order in Kagome Superconductor (Rb, K)V${}_3$Sb${}_5$ by Ultrafast Pump-probe Experiments
• Coherent Phonon Pairs and Rotational Symmetry Breaking of Charge Density Wave Order in the Kagome Superconductor CsV${}_3$Sb${}_5$
• Lattice dynamics study of electron-correlation-induced charge density wave in antiferromagnetic kagome metal FeGe
• Theories for charge-driven nematicity in kagome metals
• Charge-density-wave quantum critical point under pressure in 2$H$-TaSe${}_2$
• Metastability in Coexisting Competing Orders
• Impact of Charge Density Waves on Superconductivity and Topological Properties in AV${}_3$Sb${}_5$ Kagome Superconductors
• Origin and stability of generalized Wigner crystallinity in triangular moiré systems
• Superconductivity and Electron Correlations in Kagome Metal LuOs3B2
• Multi-orbital two-particle self-consistent approach -- strengths and limitations
• Frustrated phonon with charge density wave in vanadium Kagome metal
• Nonthermal order by disorder
• Symmetry-broken ground state and phonon mediated superconductivity in Kagome CsV${}_3$Sb${}_5$
• Nonequilibrium control of kagome metals
• Microscopic origin of period-four stripe charge-density-wave in kagome metal CsV${}_3$Sb${}_5$