Evidence for Two Energy Gaps in Superconducting Ba0.6K0.4Fe2As2 Single Crystals and the Breakdown of the Uemura Plot
Cong Ren, Zhao-Sheng Wang, Hui-Qian Luo, Huan Yang, Lei Shan, Hai-Hu Wen
DOI 10.1103/PhysRevLett.101.257006 · Physical Review Letters
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Abstract
We report a detailed investigation on the lower critical field Hc1 of the superconducting Ba0.6K0.4Fe2As2 (122) single crystals. A pronounced kink is observed on the Hc1(T) curve, which is attributed to the existence of two superconducting gaps. By fitting the data Hc1(T) to the two-gap BCS model in the full temperature region, a small gap of Δa(0)=2.0±0.3 meV and a large gap of Δb(0)=8.9±0.4 meV are obtained. The in-plane penetration depth λab(0) is estimated to be 105 nm corresponding to a rather large superfluid density, which points to the breakdown of the Uemura plot in 122 superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba0.6K0.4Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 36.2 | Pressure not reported | onset |
| Ba0.6K0.4Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35.8 | Pressure not reported | onset |
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