Electron-boson coupling and two superconducting gaps in optimally electron-doped BaFe1.9Ni0.1As2 single crystals
Zhao-Sheng Wang, Zhen-Yu Wang, Hui-Qian Luo, Xing-Ye Lu, Jun Zhu, Chun-Hong Li, Lei Shan, Huan Yang, Hai-Hu Wen, Cong Ren
DOI 10.1103/PhysRevB.86.060508 · Physical Review B
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Abstract
We report an investigation on c-axis point-contact Andreev reflection (PCAR) spectroscopy of optimally doped BaFe1.9Ni0.1As2 single crystals. The PCAR spectrum features the structures of a conductance peak with the energy scale of an electron-boson coupling mode. Quantitative analysis using a generalized Blonder-Tinkham-Klapwijk formalism with two gaps—one isotropic and another angle dependent—resolves a nodeless state in the strong-coupling limit with gap minima on the Fermi surfaces. Using the extracted superconducting energy gap value, a characteristic boson energy Ωb is obtained. Our results are consistent with the pairing interaction mediated by the antiferromagnetic spin fluctuations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe1.9Ni0.1As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | onset |
| BaFe1.9Ni0.1As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | onset |
| BaFe1.8Co0.2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 24 | Pressure not reported | unknown |
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