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Using multiple Andreev reflection (MAR) spectroscopy, we studiedsuperconductor - normal metal - superconductor (SnS) semiballistic contactswith incoherent transport in overdoped pnictide superconductorsBaFe$_{1.86}$Ni$_{0.14}$As$_2$ with critical temperature $T_c \approx 12$ K. Wedirectly determined an anisotropic large gap with the characteristic ratios$2\Delta_L^{\rm out}(0)/k_BT_c \approx 6$ and $2\Delta_L^{\rm in}(0)/k_BT_c\approx 4$, almost isotropic small gap with $2\Delta_S(0)/k_BT_c \approx 2$,and the temperature dependence of the resolved superconducting orderparameters. Above the large gap position $2\Delta_L$, a fine dI(V)/dV structurefully vanishing at $T_c$ and possibly caused by a resonant coupling with abosonic mode was observed.

physical review. b./physical review. b

Superconducting Order Parameters in overdoped  BaFe$_{1.86}$Ni$_{0.14}$As$_2$ Revealed by Multiple Andreev Reflection  Spectroscopy of Planar Break-Junctions