The hall effect as a probe of fluctuating superconductivity in disordered two-dimensional films

Magnetotransport effects have long been used to investigate order parameter fluctuations and vortex dynamics in both high-Tc and conventional superconductors. We will describe recent experimental studies of the fluctuation-induced Hall effect in amorphous superconducting films of tantalum nitride and indium oxide. Our measurements are consistent with theoretical analyses of Gaussian fluctuation contributions to the Hall signal. This approach, which has shown success in recent studies of the fluctuation-induced Nernst effect, may yield an independent measure of the superconducting coupling strength.