Vortex Structure and Anisotropic Superconducting Gaps in Ba[Fe(Ni)]2As2

We studied nearly optimally Ni-substituted BaFe 2− x Ni x As 2 (BFNA) single crystals with T C ≈ 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 And...

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Bibliographic Details
Published in:Journal of superconductivity and novel magnetism 2016-12, Vol.29 (12), p.3059-3064
Main Authors: Kuzmicheva, T. E., Vlasenko, V. A., Gavrilkin, S. Yu, Kuzmichev, S. A., Pervakov, K. S., Roshchina, I. V., Pudalov, V. M.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Condensed Matter Physics
Magnetic Materials
Magnetism
Original Paper
Physics
Physics and Astronomy
Strongly Correlated Systems
Superconductivity
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Summary:We studied nearly optimally Ni-substituted BaFe 2− x Ni x As 2 (BFNA) single crystals with T C ≈ 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 / k B T C > 4.1 evidences for a strong coupling in the Δ L -bands.
ISSN:1557-1939
1557-1947
DOI:10.1007/s10948-016-3816-4