Superconducting order parameters in overdoped BaFe1.86Ni0.14As2 revealed by multiple Andreev reflection spectroscopy of planar break junctions
T. E. Kuzmicheva, S. A. Kuzmichev, K. S. Pervakov, V. A. Vlasenko
DOI 10.1103/PhysRevB.104.174512 · Physical Review B
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Abstract
Using multiple Andreev reflection spectroscopy, we studied superconductor–normal metal–superconductor semiballistic contacts with incoherent transport in overdoped pnictide superconductors BaFe1.86Ni0.14As2 with critical temperature Tc≈12K. We directly determined an anisotropic large gap with the characteristic ratios 2ΔLout(0)/kBTc≈6 and 2ΔLin(0)/kBTc≈4, almost isotropic small gap with 2ΔS(0)/kBTc≈2, and the temperature dependence of the resolved superconducting order parameters. Above the large gap position 2ΔL, a fine dI(V)/dV structure fully vanishing at Tc and possibly caused by a resonant coupling with a bosonic mode was observed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe1.86Ni0.14As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | Pressure not reported | unknown |
| BaFe1.86Ni0.14As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | Pressure not reported | unknown |
| BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| 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 | unknown |
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