Pressure-Driven Quantum Criticality in Iron-Selenide Superconductors
Jing Guo, Xiao-Jia Chen, Jianhui Dai, Chao Zhang, Jiangang Guo, Xiaolong Chen, Qi Wu, Dachun Gu, Peiwen Gao, Lihong Yang, Ke Yang, Xi Dai, Ho-kwang Mao, Liling Sun, Zhongxian Zhao
DOI 10.1103/PhysRevLett.108.197001 · Physical Review Letters
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Abstract
We report a finding of a pressure-induced quantum critical transition in K0.8FexSe2 (x=1.7 and 1.78) superconductors through in situ high-pressure electrical transport and x-ray diffraction measurements in diamond anvil cells. Transitions from metallic Fermi liquid behavior to non-Fermi liquid behavior and from antiferromagnetism to paramagnetism are found in the pressure range of 9.2–10.3 GPa, in which superconductivity tends to disappear. The change around the quantum critical point from the coexisting antiferromagnetism state and the Fermi liquid behavior to the paramagnetism state and the non-Fermi liquid behavior in the iron-selenide superconductors demonstrates a unique mechanism for their quantum critical transition.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| K0.8Fe1.7Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32.5 | Pressure unresolved | onset |
| K0.8Fe1.7Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30.6 | Pressure unresolved | zero_resistance |
| K0.8Fe1.7Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 48 | 10.5 GPa | unknown |
| K0.8Fe1.78Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 48 | 10.7 GPa | unknown |
| KFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | unknown |
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