Anisotropic superconducting properties of FeSe0.5Te0.5 single crystals

We investigated the anisotropic electrical transport and magnetic properties of FeSeTesingle crystals grown by the self-flux method.The in-plane resistivity shows a metallic-like temperature dependence,while the out-of-plane resistivity shows a broad hump with a maximum at around 64 K.The magnetization loops for H//c-axis and H//ab-plane are also different,for example,there is a typical second peak for H//c-axis.The in-plane critical current density is larger than the out-of-plane one.The coherence length and penetration depth were estimated by the Ginzburg-Landau theory.The anisotropic parameter γ depends on the applied magnetic field and the temperature.The coupling of superconducting FeSe(Te) layers and the flux pinning mechanism relevant to anisotropy are also discussed.