arXiv · cond-mat/9705197
Low-temperature resistivity of single crystals YBa_2Cu_3O_{6+x} in the normal state
Abstract
A scan of the superconductor -- nonsuperconductor transformation in single crystals YBa_2Cu_3O_{6+x} (x about 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 ρ_{ab} 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 σ_{ab}=1/ρ_{ab} by a power law typical for a 3D-material near a metal -- insulator transition is also plausible. The vertical conductivity σ_c=1/ρ_c followed the power law and neither σ_c(T), nor ρ_c(T) could be fitted by log(T). It follows from the ρ_c measurements that the transformation at T=0 is split into two transitions: superconductor -- normal-metal and normal-metal -- insulator. In our samples, they are distanced in the oxygen content by Δx\approx0.025.
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V. F. Gantmakher, L. P. Kozeeva, A. N. Lavrov, D. A. Pushin, D. V. Shovkun, G. E. Tsydynzhapov, .. 1998-10-19. Low-temperature resistivity of single crystals YBa_2Cu_3O_{6+x} in the normal state. https://arxiv.org/abs/cond-mat/9705197
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