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Pressure-induced unconventional charge-density-wave states in kagome metal AV3Sb5 (A=K, Rb, Cs)

Zhimian Wu1, Linpeng Nie1, Ye Yang3, Kuanglv Sun1, Huachen Rao1, Dan Zhao1, Zhongjun Li3, Tao Wu1,2,4,5,*, and Xianhui Chen1,2,4,5,†

  • *Contact author: wutao@ustc.edu.cn
  • †Contact author: chenxh@ustc.edu.cn
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Phys. Rev. Research 8, 043050 – Published 14 October, 2026

DOI: https://doi.org/10.1103/gz25-y2v2

Abstract

Since the discovery of charge density wave (CDW) and superconductivity, kagome metal AV3Sb5 (A=K, Rb, Cs) provides a new platform for exploring novel many-body quantum phenomena. In CsV3Sb5, a stripelike CDW with commensurate wave vector q=3/8 was observed under moderate pressures, which leads to a peculiar superconducting double-dome behavior in pressure-dependent phase diagram. Previous density functional theory (DFT) calculations indicate that the pressure-induced stripelike CDW is beyond conventional phonon softening scenario, suggesting a nontrivial role of electronic correlations. However, an in-depth understanding for the pressure-induced unconventional CDW remains elusive. Here, we performed pressure-dependent V51 nuclear magnetic resonance (NMR) measurements on KV3Sb5 and RbV3Sb5. Although the superconducting double-dome behavior is absent in pressurized KV3Sb5 and RbV3Sb5, a pressure-induced CDW phase, ascribed to a possible incommensurate triple-Q CDW, is identified by NMR spectra in both materials, indicating that the pressure-induced unconventional CDW beyond DFT calculations is a common feature for kagome metal AV3Sb5. In contrast to the stripelike CDW, the pressure-induced incommensurate triple-Q CDW does not strongly suppress the superconducting temperature (Tc) but coincides with an almost plateau behavior at intermediate pressure regime in the pressure-dependent superconducting phase diagram. Furthermore, by systematically analyzing the Korringa relation between Knight shift and nuclear spin-lattice relaxation rate in AV3Sb5, Van Hove singularity-driven electronic fluctuations are revealed as an effective knob for the pressure-induced unconventional CDW. Finally, our present findings underscore the pressure-induced unconventional CDW as a novel correlated quantum state in kagome metal AV3Sb5.

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Phys. Rev. Research 8, 043050– Published 14 October, 2026
  • Received 16 June 2026
  • Accepted 23 September 2026
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