Measurements of the superconducting fluctuations in optimally-doped BaFe${}_{2-x}$Ni${}_x$As${}_2$ under high magnetic fields: Probing the 3D anisotropic Ginzburg-Landau approach

Abstract

The superconducting fluctuations well inside the normal state of Fe-based superconductors were experimentally studied through the in-plane paraconductivity in several high-quality optimally-doped BaFe${}_{2-x}$Ni${}_x$As${}_2$ crystals. These measurements were performed in magnetic fields with amplitudes up to 14 T, and different orientations relative to the crystals c axis (0, 53 and 90 degrees). The results allowed a stringent check of the applicability of a recently proposed Ginzburg-Landau approach for the fluctuation electrical conductivity of 3D anisotropic materials in presence of finite applied magnetic fields.

15 pages including 7 figures

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Cited by in corpus (6)

• Quasi-2D behavior of 112-type iron-based superconductors
• Multiband effects on the upper critical field angular dependence of 122-family iron pnictide superconductors
• Anisotropy of the superconducting fluctuations in multiband superconductors: the case of LiFeAs
• Flux-flow and vortex-glass phase in iron pnictide BaFe${}_{2-x}$Ni${}_x$As${}_2$ single crystals with $T_c$ $\sim$ 20 K
• Enhancement of the critical current by surface irregularities in Fe-based superconductors
• Fluctuating Cooper pairs in FeSe at temperatures exceeding double Tc