Magnetoresistivity and filamentary superconductivity in nickel-doped BaFe<sub>2</sub>As<sub>2</sub>

Magnetoresistivity and filamentary superconductivity in nickel-doped BaFe₂As₂

Zhang Wei^{1, 2}, Dai Yao-Min², Xu Bing², Yang Run², Liu Jin-Yun², Sui Qiang-Tao², Luo Hui-Qian², Zhang Rui², Lu Xing-Ye², Yang Hao^{3, †,}, Qiu Xiang-Gang^{2, ‡,}

(a) Temperature-dependent reduced resistivity ρ(T)/ρ(300 K) curves for BaFe_1.97Ni_0.03As₂ single crystal with different applied magnetic fields (H = 1 T–9 T). (b) H–T phase diagrams of BaFe_2−xNi_xAs₂ single crystal (x = 0.03 and x = 0.10). The black solid lines are fits of the data by using the GL expression, the red dotted lines are fits with the Werthemer–Helfand–Hohenberg (WHH) model.