The transport properties of Bi-riched Bi2Sr2CuO6+δ single crystal

As-grown superconducting Bi-riched Bi2Sr2CuO6+δ single crystals have been grown by the traveling solvent floating zone technique. The superconducting transition temperature Tc was about 6 K and the room temperature resistivity was about 2×10−3 Ohm-cm. Transport properties, such as resistivity, magnetoresistance and Hall effect were measured from overdoped to underdoped samples annealed in inert atmosphere at 650°C. The transition temperature can be raised to 12 K after post annealing. The Hall measurement shows that the hole carrier density decrease after annealing. The temperature dependence of Hall angle is T1.5, not quadratic as observed for most high-Tc superconducting oxides such as YBa2Cu3O7. The variation of onset Tc with different external magnetic field is very different from high-Tc superconductors. The in-plane conductivity shows the dependence of ln T and can be explained by weak localization theory.