Hall conductivity dominated by fluctuations near the superconducting transition in disordered films

We have studied the Hall effect in superconducting tantalum nitride films. We find a large contribution to the Hall conductivity near the superconducting transition, which we can track to temperatures well above \(T_c\) and magnetic fields well above the upper critical field, \(\text{\text{H}}_{c2}(0)\). This contribution arises from Aslamazov-Larkin superconducting fluctuations, and we find quantitative agreement between our data and recent theoretical analysis based on time dependent Ginzburg-Landau theory.