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- Title
The breakdown of both strange metal and superconducting states at a pressure-induced quantum critical point in iron-pnictide superconductors.
- Authors
Cai, Shu; Zhao, Jinyu; Ni, Ni; Guo, Jing; Yang, Run; Wang, Pengyu; Han, Jinyu; Long, Sijin; Zhou, Yazhou; Wu, Qi; Qiu, Xianggang; Xiang, Tao; Cava, Robert J.; Sun, Liling
- 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. The strange metal state, characterized by a linear-in-temperature resistivity, is often seen in the normal state of high-temperature superconductors. Here, the authors report the breakdown of both the strange metal and superconducting states at a pressure-induced quantum critical point in an iron-pnictide superconductor.
- Subjects
SUPERCONDUCTING transition temperature; QUANTUM states; SUPERCONDUCTORS; IRON-based superconductors; HIGH temperature superconductors; SUPERCONDUCTING transitions; QUANTUM phase transitions
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-38763-4