Abstract
We present measurements of the in-plane resistivityρ ab of YBa2Cu3O7−δ single crystals withT c ≃92 K andρ ab (100 K)≃50 μω cm. The temperature dependence of the fluctuation conductivity and of the magnetoconductivity aboveT c is analyzed in terms of direct and indirect fluctuation contributions for layered superconductors. The combination of fluctuation conductivity and magnetoconductivity allows to determine both coherence lengthsξ ab (0) andξ c (0) as well as the phase-relaxation timeτ ϕ of the pairs in an unequivocal manner. Evidence for clean limit type-II superconductivity in our crystals is given by large values of the mean free pathl ab ≫ξ ab (0).
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Dedicated to Prof. Dr. F. Hund on the occasion of his 95th birthday
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Winzer, K., Kumm, G. Fluctuation-enhanced conductivity and magnetoconductivity of high-quality YBa2Cu3O7−δ crystals. Z. Physik B - Condensed Matter 82, 317–321 (1991). https://doi.org/10.1007/BF01357171
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DOI: https://doi.org/10.1007/BF01357171