Low-temperature resistivity of YBa2Cu3O6+x
single crystals in the normal state |
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Authors: | V F Gantmakher D A Pushin D V Shovkun G E Tsydynzhapov L P Kozeeva A N Lavrov |
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Institution: | (1) Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russia;(2) Institute of Inorganic Chemistry, Siberian Branch of the, Russian Academy of Sciences, 630090 Novosibirsk, Russia |
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Abstract: | A scan of the superconductor-nonsuperconductor transformation in single crystals of YBa2Cu3O6+x
(x≈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 ρab 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 σab=1/ ρ ab by a power law, typical for a 3D material near a metal-insulator transition, is also plausible. The vertical conductivity
σc=1/ρc followed a power law, and neither σc(T), nor ρc(T) could be fitted by log T. It follows from the ρc 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 Δx≈0.025.
Pis’ma Zh. éksp. Teor. Fiz. 65, No. 11, 834–839 (10 June 1997)
Published in English in the original Russian journal. Edited by Steve Torstveit. |
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