Electronic Transport in the Low-Temperature Liquid Phase of a Thin Amorphous Film without the Edge Effects

摘要

We study the possible edge-pinning effects on the transport properties in the low-temperature (T) liquid phase of a thin amorphous Mo_(x)Si_(1-x) film with the Corbino-Disk (CD) and strip-like contact geometries. In CD, in the presence of a radial current, field-induced vortices rotate around the center of the sample without crossing the sample edges and, hence, the edge effects are negligible. In both geometries we observe the two-dimensional field-driven superconductor-insulator transition at T -> 0. This result indicates that the edge effects are not important and the absence of an intermediate metallic vortex phase at T velence 0 is intrinsic in our thin amorphous films.