LAUSR

Using multiple Andreev reflection (MAR) spectroscopy, we studied superconductor normal metal superconductor (SnS) semiballistic contacts with incoherent transport in overdoped pnictide superconductors BaFe1.86Ni0.14As2 with critical temperature Tc ≈ 12 K. We directly determined an anisotropic large gap with the characteristic ratios 2L(0)/kBTc ≈ 6 and 2L(0)/kBTc ≈ 4, almost isotropic small gap with 2S(0)/kBTc ≈ 2, and the temperature dependence of the resolved superconducting order parameters. Above the large gap position 2L, a fine dI(V)/dV structure fully vanishing at Tc and possibly caused by a resonant coupling with a bosonic mode was observed.