Anisotropic renormalized fluctuations in the microwave resistivity in YBa2Cu3O7-delta

We discuss the excess conductivity above T-c due to renormalized order-parameter fluctuations in YBa2Cu3O7-delta (YBCO) at microwave frequencies. We calculate the effects of the uniaxial anisotropy on the renormalized fluctuations in the Hartree approximation, extending the isotropic theory developed by Dorsey [Phys. Rev. B 43, 7575 (1991)]. Measurements of the real part of the microwave resistivity at 24 and 48 GHz and of the de resistivity are performed on different YBCO films. The onset of the superconducting transition and the deviation from the linear temperature behavior above T-c can be fully accounted for by the extended theory. According to the theoretical calculation here presented, a departure from Gaussian toward renormalized fluctuations is observed. Very consistent values of the fundamental parameters (critical temperature, coherence lengths, penetration depth) of the superconducting state are obtained. [S0163-1829(98)01342-3].