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The breakdown of both strange metal and superconducting states at a pressure-induced quantum critical point in iron-pnictide superconductors

Author

Listed:
  • Shu Cai

    (Chinese Academy of Sciences)

  • Jinyu Zhao

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Ni Ni

    (Princeton University
    UCLA)

  • Jing Guo

    (Chinese Academy of Sciences
    Songshan Lake Materials Laboratory)

  • Run Yang

    (Chinese Academy of Sciences)

  • Pengyu Wang

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Jinyu Han

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Sijin Long

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Yazhou Zhou

    (Chinese Academy of Sciences)

  • Qi Wu

    (Chinese Academy of Sciences)

  • Xianggang Qiu

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    Songshan Lake Materials Laboratory)

  • Tao Xiang

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Robert J. Cava

    (Princeton University)

  • Liling Sun

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    Songshan Lake Materials Laboratory)

Abstract

Here we report the first observation of the concurrent breakdown of the strange metal (SM) normal state and superconductivity at a pressure-induced quantum critical point in Ca10(Pt4As8)((Fe0.97Pt0.03)2As2)5 superconductor. We find that, upon suppressing the superconducting state, the power exponent (α) changes from 1 to 2, and the slope of the temperature-linear resistivity per FeAs layer (A□) gradually diminishes. At a critical pressure, A□ and superconducting transition temperature (Tc) go to zero concurrently, where a quantum phase transition from a superconducting state with a SM normal state to a non-superconducting Fermi liquid state occurs. Scaling analysis reveals that the change of A□ with Tc obeys the relation of Tc ~ (A□)0.5, similar to what is seen in other chemically doped unconventional superconductors. These results suggest that there is a simple but powerful organizational principle of connecting the SM normal state with the high-Tc superconductivity.

Suggested Citation

  • Shu Cai & Jinyu Zhao & Ni Ni & Jing Guo & Run Yang & Pengyu Wang & Jinyu Han & Sijin Long & Yazhou Zhou & Qi Wu & Xianggang Qiu & Tao Xiang & Robert J. Cava & Liling Sun, 2023. "The breakdown of both strange metal and superconducting states at a pressure-induced quantum critical point in iron-pnictide superconductors," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-38763-4
    DOI: 10.1038/s41467-023-38763-4
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