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VOLUME 65 | ISSUE 11 | PAGE 834
Low-temperature resistivity of single crystals YBa2Cu3O6+x in the normal state
A scan of the superconductor nonsuperconductor transformation in single crystals + {x w 0.37) was done in two alternative ways, namely, by applying the magnetic field and by reducing the hole concentration through the oxygen rearrangement. The in-plane normal-state resistivity p„j obtained in both cases was quite similar; its temperature dependence can be fitted by logarithmic law in the temperature range of almost two decades. However, a different representation of the <rafc ~ 1 / by a power law typical for a 3D-material near a metal insulator transition is also plausible. The vertical conductivity ae ~ l/pc followed the power law and neither <rc(T), nor Pc(T) could be fitted by logT. It follows from the pc measurements that the transformation at Τ 0 is split into two transitions: superconductor normal-metal and normal-metal insulator. In our samples, they are distanced in the oxygen content by Δχ S3 0.025. PACS: 71.30.+h, 72.30.-i, 74.72.Bk