Superconducting order parameters in overdoped BaFe(1.86)Ni(0.14)As2 revealed by multiple Andreev reflection spectroscopy of planar break junctionsстатья
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Аннотация:Using multiple Andreev reflection spectroscopy, we studied superconductor–normal metal–superconductor semiballistic contacts with incoherent transport in overdoped pnictide superconductors BaFe{1.86}Ni{0.14}As2 with critical temperature Tc ≈ 12K. We directly determined an anisotropic large gap with the characteristic ratios 2Δ_{L,out}(0)/kTc ≈ 6 and 2Δ_{L,in}(0)/kTc ≈ 4, almost isotropic small gap with 2Δ_S(0)/kTc ≈ 2, and the temperature dependence of the resolved superconducting order parameters. Above the large gap position 2Δ_L, a fine dI(V)/dV structure fully vanishing at Tc and possibly caused by a resonant coupling with a bosonic mode was observed.