Resistivities of ceramic and single-crystalline superconducting oxides to 1100K: What do they tell us?

M. Gurvitch, A. T. Fiory, L. S. Schneemeyer, R. T. Cava, G. P. Espinosa, J. V. Waszczak

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Resistivities ϱ(T) of ceramic samples of La1.825Sr0.175CuO4 (LSCO) and both ceramic and single-crystalline (a-b plane, containing micro-twins) samples of YBa2Cu3O7 (YBCO) were measured from Tc to 1100K. The observed absence of saturation in the linear parts of ϱ(T) implies weak electron-phonon coupling in both superconductors, thus excluding the possibility of phonon-mediated superconductivity. Oxygen desorption causes faster than linear dependence at T 〉 800 K in YBCO crystals (compared to T 〉 600 K for ceramics), demonstrating that inelastic scattering is linear in T up to at least 800 K.

Original languageEnglish
Pages (from-to)1369-1370
Number of pages2
JournalPhysica C: Superconductivity and its applications
StatePublished - 1 Jan 1988


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