Charge density wave order and fluctuations above T${}_{CDW}$ and below superconducting T${}_c$ in the kagome metal CsV${}_3$Sb${}_5$

Abstract

The phase diagram of the kagome metal family \ch{AV3Sb5} (A = K, Rb, Cs) features both superconductivity and charge density wave (CDW) instabilities, which have generated tremendous recent attention. Nonetheless, significant questions remain. In particular, the temperature evolution and demise of the CDW state has not been extensively studied, and little is known about the co-existence of the CDW with superconductivity at low temperatures. We report an x-ray scattering study of \ch{CsV3Sb5} over a broad range of temperatures from 300 K to $\sim$ 2 K, below the onset of its superconductivity at ${\text{T}}_{\text{c}}\sim$ 2.9 K. Order parameter measurements of the $2\times 2\times 2$ CDW structure show an unusual and extended linear temperature dependence onsetting at $T^{\ast }$ $\sim$ 160 K, much higher than the susceptibility anomaly associated with CDW order at ${\text{T}}_{\text{CDW}}=94$ K. This implies strong CDW fluctuations exist to $\sim 1.7\times {\text{T}}_{\text{CDW}}$. The CDW order parameter is observed to be constant from $T=16$ K to 2 K, implying that the CDW and superconducting order co-exist below ${\text{T}}_{\text{c}}$, and, at ambient pressure, any possible competition between the two order parameters is manifested at temperatures well below ${\text{T}}_{\text{c}}$, if at all. Anomalies in the temperature dependence in the lattice parameters coincide with ${\text{T}}_{\text{CDW}}$ for $\text{c}(T)$ and with $T^{\ast }$ for $a(T)$.

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• Charge-loop current order and Z3 nematicity mediated by bond-order fluctuations in kagome metal AV3Sb5 (A=Cs,Rb,K)
• Commensurate-to-incommensurate transition of charge-density-wave order and a possible quantum critical point in pressurized kagome metal CsV${}_3$Sb${}_5$
• Charge fluctuations above $T_{\mathrm{CDW}}$ revealed by glasslike thermal transport in kagome metals $A$V${}_3$Sb${}_5$ ($A$ = K, Rb, Cs)
• Distinct switching of chiral transport in the kagome metals KV${}_3$Sb${}_5$ and 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
• Phenomenology of bond and flux orders in kagome metals
• Kagome metals
• Kagome Materials I: SG 191, ScV${}_6$Sn${}_6$. Flat Phonon Soft Modes and Unconventional CDW Formation: Microscopic and Effective Theory
• Uniaxial strain tuning of charge modulation and singularity in a kagome superconductor
• Dynamical decoding of the competition between charge density waves in a kagome superconductor
• Frustrated charge density wave and quasi-long-range bond-orientational order in the magnetic kagome FeGe
• Condensation of preformed charge density waves in kagome metals
• Conventional Superconductivity in the Doped Kagome Superconductor Cs(V0.86Ta0.14)3Sb5 from Vortex Lattice Studies
• Fluctuated lattice-driven charge density wave far above the condensation temperature in kagome superconductor KV${}_3$Sb${}_5$
• Exceptionally Slow, Long Range, and Non-Gaussian Critical Fluctuations Dominate the Charge Density Wave Transition
• Unveiling van Hove singularity modulation and fluctuated charge order in kagome superconductor $\mathrm{Cs}{\mathrm{V}}_3\mathrm{S}{\mathrm{b}}_5$ via time-resolved ARPES
• Coherent Phonon Pairs and Rotational Symmetry Breaking of Charge Density Wave Order in the Kagome Superconductor CsV${}_3$Sb${}_5$
• Theories for charge-driven nematicity in kagome metals
• Metastability in Coexisting Competing Orders
• Nonthermal order by disorder
• Nonequilibrium control of kagome metals
• Time-Resolved Photoemission Spectroscopy of Quantum Materials Using High Harmonic Generation: Probing Electron-Phonon Interactions and Non-Equilibrium Dynamics
• Non-Abelian line graph: A generalized approach to flat bands