Abstract
The rounding effects above the superconducting transition of the electrical resistivity and of the magnetic susceptibility in low magnetics fields have been measured in the same YBa 2Cu 3O 7−δ (YBCO) single crystals. When analyzed in terms of independent gaussian fluctuations of the superconducting order parameter in layered materials, an scenario compatible with these experimental results is: Absence of appreciable Maki-Thompson contribution to the paraconductivity, ξ ab (0)=(10 ± 2) A ̊ , ξ c(0)=(1.2 ± 0.3) A ̊ , d e=s=11.7 A ̊ , and conventional 1s 0 wave pairing or one complex component unconventional pairing.
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