Abstract
We report anisotropic electrical resistivity of La2−x Cax CuO4−y single crystals, with x=0.05 and 0.09, grown by TSFZ method. It is found that in the normal state both resistivities ρab (T) and ρc (T) displays semiconducting behavior for non-superconducting (x=0.05) and superconducting (x=0.09) single crystals. In-plane resistivity ρab (T) becomes metallic and shows a resistivity minimum at certain minimum temperature Tmin that separates regions of metallic behavior at T > Tmin from semiconducting behavior at T < Tmin by annealing in oxygen, while ρc (T) behavior remains semiconducting. In low-temperature region (Tc < T < Tmin) gradual upturn of resistivity (ρab (T)) has been observed for superconducting samples. This is argued to be due to electron localization effects. The Anderson-Zou fit to the experimental data works well for metallic and variable range hopping (VRH) law to the non-metallic samples.
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