Abstract
The paraconductivity of a number of c-axis-orientedYBa2Cu3Ox thin films, with a range of c-axislattice parameters and Tc-values, has been determined as afunction of temperature and analysed in terms of theparaconductivity due to direct and indirect fluctuationcontributions. We present results on the c-axis coherence lengthand the phase-relaxation time at 100 K obtained from the fit to theparaconductivity data. The paraconductivity results for optimallydoped films were: c-axis coherence length: ξc(0) = 1.25 Å; pair-breaking parameter: δ = 0.05;phase-relaxation time at 100 K: τϕ = 0.066 ps; andtwo-three-dimensional crossover temperature: T+ = 96.6 K. Thesevalues are in good agreement with those from other published work.There was considerable scatter in the coherence length andphase-relaxation time for films with different critical temperaturesand oxygen contents. These results were process dependent butappear to be related to the 60 K phase transition in the Tc-x phase diagram.
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