Abstract
We present measurements of the dc and microwave excess conductivity above Tc in anisotropic superconducting cuprates and MgB2. When temperature raises well above Tc, both the dc and microwave excess conductivities drop much faster than predicted by the well-established Gaussian theory. We introduce a spectral cutoff in the calculation of the finite-frequency fluctuational conductivity in order to suppress the contribution of high-momentum modes at high temperatures. We find that our data are well described by the model for appropriate dimensionalities.
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