Quantum Criticality and Nodal Superconductivity in the FeAs-Based Superconductor KFe2As2
J. K. Dong, S. Y. Zhou, T. Y. Guan, H. Zhang, Y. F. Dai, X. Qiu, X. F. Wang, Y. He, X. H. Chen, S. Y. Li
DOI 10.1103/PhysRevLett.104.087005 · Physical Review Letters
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Abstract
The in-plane resistivity ρ and thermal conductivity κ of the FeAs-based superconductor KFe2As2 single crystal were measured down to 50 mK. We observe non-Fermi-liquid behavior ρ(T)∼T1.5 at Hc2=5 T, and the development of a Fermi liquid state with ρ(T)∼T2 when further increasing the field. This suggests a field-induced quantum critical point, occurring at the superconducting upper critical field Hc2. In zero field, there is a large residual linear term κ0/T, and the field dependence of κ0/T mimics that in d-wave cuprate superconductors. This indicates that the superconducting gaps in KFe2As2 have nodes, likely d-wave symmetry. Such a nodal superconductivity is attributed to the antiferromagnetic spin fluctuations near the quantum critical point.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| KFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | midpoint |
| KFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | onset |
| CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.3 | Pressure not reported | unknown |
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