Vortex Structure and Anisotropic Superconducting Gaps in Ba[Fe(Ni)]2As2статья
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Дата последнего поиска статьи во внешних источниках: 18 февраля 2017 г.
Аннотация:We studied nearly optimally Ni-substituted BaFe(2−x)Ni(x)As2 (BFNA) single crystals with Tc ≈ 18.5 K. In irreversible magnetization measurements, we determined the field dependence of the critical current density and discuss the nature of observed strong bulk pinning. Using intrinsic multiple Andreev reflections effect (IMARE) spectroscopy, we directly determine two distinct superconducting gaps and resolve their moderate anisotropy in the momentum space. The BCS-ratio for the large gap 2Δ_L/kTc > 4.1 evidences for a strong coupling in the Δ_L-bands.