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Effect of grain boundaries on paraconductivity of YBa2Cu3Ox
Authors:D.K. Aswal  Ajay SinghShashwati Sen  Manmeet KaurC.S. Viswandham  G.L. GoswamiS.K. Gupta
Affiliation:a Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Center, Mumbai 400 085, India
b Atomic Fuels Division, Bhabha Atomic Research Center, Mumbai 400 085, India
Abstract:To investigate the effect of grain boundaries on paraconductivity of YBa2Cu3Ox, melt-textured and c-axis oriented thin films with controlled grain boundaries (superconducting transition width, ΔT, varying between 0.54 and 2.85 K) were prepared, and dc-conductivity has been measured as a function of temperature. In the logarithmic plots of excess-conductivity (Δσ) and reduced temperature (?), starting from low values of ?, we have observed three different regions namely critical region, mean field region and short wave fluctuation region. A correlation is observed between the range of critical region and ΔT, which is found to increase with ΔT. While for ΔT values smaller than 2.5 K only static critical region is observed, for higher ΔTs both static and dynamic critical regions are observed. In the mean field region a crossover from 3D to 2D was observed for all the samples. At ? values larger than 0.24, the excess-conductivity decreased sharply as ?−3, which suggested the existence of the short wave fluctuations.
Keywords:A. Oxides   B. Epitaxial growth   D. Electrical conductivity   D. Superconductivity
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