Abstract
The temperature dependence of the electrical resistivity along the a and b axes of YBa 2Cu 3O 6.9 has been measured in high-purity fully-detwinned single crystals. Below 300K, ϱa〈T〉 is found to be perfectly linear, while ϱb〈T〉 reveals a distinct upward curvature. Viewing the b-axis conductivity as the sum of parallel conductivities in the CuO 2 planes and along the CuO chains, a T 2 dependence for the chain resistivity is obtained. Such a dependence, also observed in quasi-1D conductors, sheds light on a number of hitherto ill-identified deviations from linearity reported recently. Above 300K, there is a steep linear increase in ϱchain〈T〉, most likely associated with the increased oxygen mobility.
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