A broadband microwave study of the superconducting~fluctuations in 2D InOx thin films

We apply a broadband microwave `Corbino' spectrometer covering the~range from 10MHz to 20GHz to the study of 2D disordered~superconducting InOx thin films.~ Explicit frequency dependency of~the superfluid stiffness and conductivity are obtained down to 270mK.~The AC measurements are sensitive to different time scales of the~superconducting fluctuations.~ A number of fluctuation regimes are~investigated (gaussian fluctuations, vortex proliferation) as we cool~the sample into the low-temperature Kosterlitz-Thouless-Berezinskii- like phase.~We discuss our results in terms of prevailing scenarios~for fluctuation superconductivity and make connection to other~experimental results.