Vortex dynamics in two-dimensional amorphous films without edge effects

Through the comparative studies using the thin amorphous MoxSi1−x films with the Corbino-disk and strip-like contact geometries, we have demonstrated that edge pinning is not important on the static or dynamic vortex response over the broad temperature (T) and field ranges. Thus, both the field-driven superconductor-insulator transition and anomalous vortex motion observed so far in the low-T liquid phase of thin amorphous films are confirmed to be intrinsic properties. Also, we suggest that the real-time measurements of voltage fluctuations about the average flux-flow voltage may be very useful in detecting the onset of quantum-fluctuation effects.