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Anomalous enhancement of charge density wave in kagome superconductor CsV3Sb5 approaching the 2D limit

Author

Listed:
  • Boqin Song

    (Fudan University)

  • Tianping Ying

    (Chinese Academy of Sciences)

  • Xianxin Wu

    (Chinese Academy of Sciences)

  • Wei Xia

    (ShanghaiTech University
    ShanghaiTech Laboratory for Topological Physics)

  • Qiangwei Yin

    (Renmin University of China)

  • Qinghua Zhang

    (Chinese Academy of Sciences)

  • Yanpeng Song

    (Chinese Academy of Sciences)

  • Xiaofan Yang

    (Fudan University)

  • Jiangang Guo

    (Chinese Academy of Sciences)

  • Lin Gu

    (Chinese Academy of Sciences)

  • Xiaolong Chen

    (Chinese Academy of Sciences)

  • Jiangping Hu

    (Chinese Academy of Sciences)

  • Andreas P. Schnyder

    (Max-Planck-Institut für Festkörperforschung)

  • Hechang Lei

    (Renmin University of China)

  • Yanfeng Guo

    (ShanghaiTech University)

  • Shiyan Li

    (Fudan University
    Collaborative Innovation Center of Advanced Microstructures
    Shanghai Research Center for Quantum Sciences)

Abstract

The recently discovered kagome metals AV3Sb5 (A = Cs, Rb, K) exhibit a variety of intriguing phenomena, such as a charge density wave (CDW) with time-reversal symmetry breaking and possible unconventional superconductivity. Here, we report a rare non-monotonic evolution of the CDW temperature (TCDW) with the reduction of flake thickness approaching the atomic limit, and the superconducting transition temperature (Tc) features an inverse variation with TCDW. TCDW initially decreases to a minimum value of 72 K at 27 layers and then increases abruptly, reaching a record-high value of 120 K at 5 layers. Raman scattering measurements reveal a weakened electron-phonon coupling with the reduction of sample thickness, suggesting that a crossover from electron-phonon coupling to dominantly electronic interactions could account for the non-monotonic thickness dependence of TCDW. Our work demonstrates the novel effects of dimension reduction and carrier doping on quantum states in thin flakes and provides crucial insights into the complex mechanism of the CDW order in the family of AV3Sb5 kagome metals.

Suggested Citation

  • Boqin Song & Tianping Ying & Xianxin Wu & Wei Xia & Qiangwei Yin & Qinghua Zhang & Yanpeng Song & Xiaofan Yang & Jiangang Guo & Lin Gu & Xiaolong Chen & Jiangping Hu & Andreas P. Schnyder & Hechang Le, 2023. "Anomalous enhancement of charge density wave in kagome superconductor CsV3Sb5 approaching the 2D limit," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-38257-3
    DOI: 10.1038/s41467-023-38257-3
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    2. J. N. Graham & C. Mielke III & D. Das & T. Morresi & V. Sazgari & A. Suter & T. Prokscha & H. Deng & R. Khasanov & S. D. Wilson & A. C. Salinas & M. M. Martins & Y. Zhong & K. Okazaki & Z. Wang & M. Z, 2024. "Depth-dependent study of time-reversal symmetry-breaking in the kagome superconductor AV3Sb5," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    3. Yang Luo & Yulei Han & Jinjin Liu & Hui Chen & Zihao Huang & Linwei Huai & Hongyu Li & Bingqian Wang & Jianchang Shen & Shuhan Ding & Zeyu Li & Shuting Peng & Zhiyuan Wei & Yu Miao & Xiupeng Sun & Zhi, 2023. "A unique van Hove singularity in kagome superconductor CsV3-xTaxSb5 with enhanced superconductivity," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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