Vortex Variable Range Hopping in a Conventional Superconducting Film*

We will present resistance versus temperature data from a highly disordered thin film of superconducting amorphous indium oxide that is tuned through the superconductor-insulator transition by way of a perpendicular magnetic field. In the regime of non-zero field below the critical field, the transition broadens in temperature, which is understood to result from vortex motion across the film. The temperature dependence of the resistance suggests that vortices move by 2D Mott variable range hopping over a range of fields, and several decades of resistance.