2015
DOI: 10.48550/arxiv.1506.00170
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Large increase of the anisotropy factor in the overdoped region of Ba(Fe$_{1-x}$Ni$_x$)$_2$As$_2$ as probed by fluctuation spectroscopy

A Ramos-Álvarez,
J Mosqueira,
F Vidal
et al.

Abstract: We study the diamagnetism induced by thermal fluctuations above the superconducting transition of the iron pnictide Ba(Fe 1−x Nix) 2 As 2 with different doping levels. The measurements are performed with magnetic fields up to 7 T applied in the two main crystal directions. These data provide double information: first, they confirm at a quantitative level the applicability to these materials of a 3D-anisotropic Ginzburg-Landau approach valid in the finite field regime. Then, they allow to determine the doping-l… Show more

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