2021/11/17 by T. E. Kuzmicheva, S. A. Kuzmichev, K. S. Pervakov +2
Materials Science · Physics and Astronomy · #Business #Iron-based superconductors research #Order (exchange) #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.104.174512
published as Phys. Rev. B 104, 174512 (2021) · 27 pages, 10 figures
openalex publication_date 2021/11/17 · openalex created_date 2021/11/22 · arxiv created 2021/11/24 · arxiv updated 2021/11/29 · openalex updated_date 2026/08/05
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\ensuremath≈12\phantom\rule0.28em0exK. We directly determined an anisotropic large gap with the characteristic ratios 2\mathrm\ensuremathΔLout(0)/kBTc\ensuremath≈6 and 2\mathrm\ensuremathΔLin(0)/kBTc\ensuremath≈4, almost isotropic small gap with 2\mathrm\ensuremathΔS(0)/kBTc\ensuremath≈2, and the temperature dependence of the resolved superconducting order parameters. Above the large gap position 2\mathrm\ensuremathΔL, a fine dI(V)/dV structure fully vanishing at Tc and possibly caused by a resonant coupling with a bosonic mode was observed.