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- Title
Low-temperature resistivity of YBa[sub 2]Cu[sub 3]O[sub 6+x] single crystals in the normal state.
- Authors
Gantmakher, V. F.; Pushin, D. A.; Shovkun, D. V.; Tsydynzhapov, G. E.; Kozeeva, L. P.; Lavrov, A. N.
- Abstract
A scan of the superconductor–nonsuperconductor transformation in single crystals of YBa[sub 2]Cu[sub 3]O[sub 6+x](xapprox. 0.37) is done in two alternative ways, namely, by applying a magnetic field and by reducing the hole concentration through oxygen rearrangement. The in-plane normal-state resistivity ρ[sub ab] obtained in the two cases is quite similar; its temperature dependence can be fitted by a logarithmic law in a temperature range of almost two decades. However, an alternative representation of the temperature dependence of σ[sub ab]=1/ρ[sub ab] by a power law, typical for a 3D material near a metal–insulator transition, is also plausible. The vertical conductivity σ[sub c]=1/ρ[sub c] followed a power law, and neither σ[sub c](T), nor ρ[sub c](T) could be fitted by log T. It follows from the ρ[sub 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 separated in oxygen content by Δxapprox. 0.025. © 1997 American Institute of Physics.
- Subjects
CRYSTALS; SUPERCONDUCTORS
- Publication
JETP Letters, 1997, Vol 65, Issue 11, p870
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/1.567439