Possible star-of-David pattern charge density wave with additional modulation in the kagome superconductor CsV${}_3$Sb${}_5$

Abstract

$A$V${}_3$Sb${}_5$ ($A$ = K, Rb, Cs) is a novel kagome superconductor coexisting with the charge density wave (CDW) order. Identifying the structure of the CDW order is crucial for understanding the exotic normal state and superconductivity in this system. Here, we report ${}^{51}$V nuclear magnetic resonance (NMR) and ${}^{121/123}$Sb nuclear quadrupole resonance (NQR) studies on kagome-metal CsV${}_3$Sb${}_5$. Below the CDW transition temperature $T_{\text{CDW}}\sim$ 98 K, an abrupt change of spectra was observed, indicating that the transition is of the first order. By further analysing the spectra, we find that the CDW order is commensurate. And most remarkably, the obtained experimental results suggest that the charge modulation of the CDW order is of star-of-David pattern and accompanied by an additional charge modulation in bulk below $T^{\ast }\sim$ 40 K. Our results revealing the unconventional CDW order provide new insights into $A$V${}_3$Sb${}_5$.

15 pages, 4 figures

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• Classification of Lifshitz invariant in multiband superconductors: an application to Leggett modes in the linear response regime in Kagome lattice models
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• Observation of anomalous amplitude modes in the kagome metal CsV${}_3$Sb${}_5$
• Non-degenerate surface pair density wave in the Kagome superconductor CsV${}_3$Sb${}_5$ -- application to vestigial orders
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• Kagome materials $A$V${}_3$Sb${}_5$ ($A$=K,Rb,Cs): pairing symmetry and pressure-tuning studies
• Kagome KMn${}_3$Sb${}_5$ metal: Magnetism, lattice dynamics, and anomalous Hall conductivity
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• Strain-induced long-range charge-density wave order in the optimally doped Bi${}_2$Sr${}_{2-x}$La${}_x$CuO${}_6$ superconductor
• Real-space Loop Current Pattern in Time-reversal-symmetry Breaking Phase in Kagome Metals
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• Orbital selective commensurate modulations of the local density of states in ScV6Sn6 probed by nuclear spins
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