Paraconductivity at high reduced temperatures in YBa2Cu3O7-δ superconductors -: art. no. 144515

By using high quality single crystals and epitaxial thin films, the in-plane paraconductivity in almost optimally doped YBa2Cu3O7-delta, with T(c0)greater than or similar to 92 K, was determined well inside the so-called short-wavelength fluctuation regime, which corresponds to reduced temperatures, epsilon =1n(T/T-c0), above typically epsilon =0.1. It is then shown that these data may be explained in terms of the Gaussian-Ginzburg-Landau approach for bilayered superconductors by introducing a total energy cutoff, instead of the momentum cutoff approximation always used until now. These results seem to confirm the absence of appreciable pseudogap effects on the in-plane resistivity in optimally doped YBa2Cu3O7-delta superconductors.