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Deviations from linear resistivity in YBa2Cu3O6.9

✍ Scribed by Robert Gagnon; Christian Lupien; Louis Taillefer

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 270 KB
Volume: 235-240
Category: Article
ISSN: 0921-4534
DOI: 10.1016/0921-4534(94)91929-1

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✦ Synopsis

The temperature dependence of the electrical resistivity along the a and b axes of YBa2Cu306.9 has been measured in high-purity fully-detwinned single crystals. Below 300K, p a(T) is found to be perfectly linear, while p b(T) reveals a distinct upward curvature. Viewing the b-axis conductivity as the sum of parallel conductivities in the CuO2 planes and along the Cu-O chains, a T 2 dependence for the chain resistivity is obtained. Such a dependence, also observed in quasi-lD conductors, sheds light on a number of hitherto illidentified deviations from linearity reported recently. Above 300K, there is a steep linear increase in Pchain(T), most likely associated with the increased oxygen mobility.

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