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We discuss the excess conductivity at nonzero frequencies in a superconductorabove T_c within the gaussian approximation. We focus the attention on thetemperature range not too close to T_c: within a time-dependent Ginzburg-Landauformulation, we phenomenologically introduce a short wavelength cutoff (of theorder of the inverse coherence length) in the fluctuational spectrum tosuppress high momentum modes. We treat the general cases of thin wires,anisotropic thin films and anisotropic bulk samples. We obtain in all casesexplicit expressions for the finite frequency fluctuational conductivity. Thedc case directly follows. Close to T_c the cutoff has no effect, and the knownresults for Gaussian fluctuations are recovered. Above T_c, and already forepsilon = ln(T/T_c) > 10^{-2}, we find strong suppression of theparaconductivity as compared to the gaussian prediction, in particular in thereal part of the paraconductivity. At high epsilon the cutoff effects aredominant. We discuss our results in comparison with data on high-T_csuperconductors.Comment: Changed RevTe

Frequency-dependent fluctuational conductivity above $ \mathsf {T_{c}}$ in anisotropic superconductors: effects of a short wavelength cutoff