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The upper critical field (H c2 ) was determined by applying a magnetic field along the ab plane and c axis for two single crystals of BaFe 2-x Ru x As 2 (x=0.48 and 0.75). The anisotropy of the H c2 (0), γ(0)=H c2ab (0)/H c2c (0), was ~1.6 for x=0.48and ~2.3 for x=0.75. The angle-depen dent resistance measured below T c allowed perfect scaling features based on anisotropic Ginzburg -Landau theory, leading to consistent anisotropy values. Because only one fitting parameter γ is used in the scaling for each temperature, the validity of the abγvalue was compared with that determined from =H c2 /H c2c γ. The γ obtained at a temperature close to T c was 3.0 and decreased to 2.0 at low temperatures. Comparing to the anis otropy determined for electron- or hole -doped BaFe 2 As 2 using the same method, the present results point to consistent anisotropy in Ru-doped BaFe 2 As 2 with other electron- or hole-doped BaFe 2 As 2 . Keywords : Fe based superconductor, superconducting anisotropy, upper critical field

Upper critical field and superconducting anisotropy of BaFe2-xRuxAs2(x=0.48 and 0.75) single crystals

Upper critical field and superconducting anisotropy of BaFe_2-xRu_xAs₂(x=0.48 and 0.75) single crystals