The breakdown of both strange metal and superconducting states at a pressure-induced quantum critical point in iron-pnictide superconductors.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 37253725.
- Also identified by DOI 10.1038/s41467-023-38763-4 and PMC identifier 10229619.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
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 Ca<sub>10</sub>(Pt<sub>4</sub>As<sub>8</sub>)((Fe<sub>0.97</sub>Pt<sub>0.03</sub>)<sub>2</sub>As<sub>2</sub>)<sub>5</sub> 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<sup>□</sup>) gradually diminishes. At a critical pressure, A<sup>□</sup> and superconducting transition temperature (T<sub>c</sub>) 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<sup>□</sup> with T<sub>c</sub> obeys the relation of T<sub>c</sub> ~ (A<sup>□</sup>)<sup>0.5</sup>, 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-T<sub>c</sub> superconductivity.