Persistence of charge density wave fluctuations in the absence of long-range order in a hole-doped kagome metal

Kongruengkit, Terawit; Salinas, Andrea N. Capa; Pokharel, Ganesh; Ortiz, Brenden R.; Wilson, Stephen D.; Harter, John W.

doi:10.1103/fzx6-hd1b

Persistence of charge density wave fluctuations in the absence of long-range order in a hole-doped kagome metal

Journal Article · Thu Feb 05 00:00:00 EST 2026 · Physical Review Materials

DOI:https://doi.org/10.1103/fzx6-hd1b· OSTI ID:3018113

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Univ. of California, Santa Barbara, CA (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

The kagome metals 𝐴⁢V₃⁢Sb₅ (𝐴=K, Rb, Cs) exhibit a complex interplay between charge density wave (CDW) order and superconductivity. Here, in this study, we use ultrafast coherent phonon spectroscopy to probe the evolution of CDW order in hole-doped CsV₃⁢Sb_5−𝑥⁢Sn_𝑥 across a broad range of compositions (0 ≤ 𝑥 ≤ 0.68). While thermodynamic and diffraction measurements show long-range CDW order vanishes above 𝑥 ≈ 0.05, we observe persistent signatures of CDW fluctuations up to the highest doping levels, with correlation times on the order of several picoseconds. These results indicate the presence of a robust fluctuating charge order that survives well beyond the established CDW phase boundary. Furthermore, these fluctuations are enhanced near a doping-tuned quantum phase transition at 𝑥* ≈ 0.15, which coincides with a local minimum in the superconducting 𝑇_c double-dome. Additional measurements on Ti- and K-substituted samples confirm that this behavior is intrinsic to hole doping and not tied to disorder. Overall, our findings suggest that CDW fluctuations play a central role in the electronic phase diagram of 𝐴⁢V₃⁢Sb₅ and may mediate or compete with superconductivity.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC05-00OR22725

Other Award/Contract Number:: FA9550-22-1-0270
DMR-1906325

OSTI ID:: 3018113

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 2 Vol. 10; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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