Abstract
We present anisotropic transport properties for a YBa 2Cu 3O 7−δ single crystal prepared by the pulling method. The resistivity in the ab-plane (ϱ ab ), for both the as-grown sample and the oxygen-annealed sample, shows good metallic behavior. The resistivity just above T c is ∼2×10 -5 Ω cm. On the other hand, the resistivity along the c-axis (ϱ c ) changes from semiconductor-like behavior for the as-grown sample to metallic behavior for the oxygen-annealed sample. In addition, any trace of Josephson characteristics is not observed for our samples. The metallic behavior of ϱ c suggests that the Cu-O chain changes its conduction with hole doping, in addition to its role as a carrier source for the CuO 2 planes.
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