Tri-Hexagonal charge order in kagome metal CsV${}_3$Sb${}_5$ revealed by ${}^{121}$Sb NQR

Abstract

We report ${}^{121}$Sb nuclear quadrupole resonance (NQR) measurements on kagome superconductor CsV${}_3$Sb${}_5$ with $T_{\mathrm{c}}=2.5$ K. ${}^{121}$Sb NQR spectra split after a charge density wave (CDW) transition at $94$ K, which demonstrates a commensurate CDW state. The coexistence of the high temperature phase and the CDW phase between $91$ K and $94$ K manifests that it is a first order phase transition. The CDW order exhibits Tri-Hexagonal deformation with a lateral shift between the adjacent kagome layers, which is consistent with $2\times 2\times 2$ superlattice modulation. The superconducting state coexists with CDW order and shows a conventional s-wave behavior in the bulk state.

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• Quantum states and intertwining phases in kagome materials
• Microscopic nature of the charge-density wave in kagome superconductor RbV${}_3$Sb${}_5$
• Dynamical Study of the Origin of the Charge Density Wave in $A$V${}_3$Sb${}_5$ ($A=$K, Rb, Cs) Compounds
• Intertwined van-Hove Singularities as a Mechanism for Loop Current Order in Kagome Metals
• Electronic properties of correlated kagomé metals AV${}_3$Sb${}_5$(A = K, Rb, Cs): A perspective
• The structure of kagome superconductors CsV${}_3$Sb${}_5$ in the charge density wave states
• Origin of $\pi$-shifted three-dimensional charge density waves in kagome metal AV${}_3$Sb${}_5$
• Electrical and thermal transport properties of kagome metals AV${}_3$Sb${}_5$ (A=K, Rb, Cs)
• Topological Superconducting States and Quasiparticle Transport on Kagome Lattice
• Orbital selective commensurate modulations of the local density of states in ScV6Sn6 probed by nuclear spins
• Inversion and Tunability of Van Hove Singularities in $A$V${}_3$Sb${}_5$ ($A$ = K, Rb, and Cs) kagome metals