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

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 and Liling Sun ()
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Shu Cai: Chinese Academy of Sciences
Jinyu Zhao: Chinese Academy of Sciences
Ni Ni: Princeton University
Jing Guo: Chinese Academy of Sciences
Run Yang: Chinese Academy of Sciences
Pengyu Wang: Chinese Academy of Sciences
Jinyu Han: Chinese Academy of Sciences
Sijin Long: Chinese Academy of Sciences
Yazhou Zhou: Chinese Academy of Sciences
Qi Wu: Chinese Academy of Sciences
Xianggang Qiu: Chinese Academy of Sciences
Tao Xiang: Chinese Academy of Sciences
Robert J. Cava: Princeton University
Liling Sun: Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-38763-4

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