The disorder-induced Superconductor-to-Insulator Transition in amorphous NbxSi1−x two-dimensional thin films is studied for different niobium compositions x through a variation of the sample thickness d. We show that the critical thickness dc, separating a superconducting regime from an insulating one, increases strongly with diminishing x, thus attaining values of over 100 {\AA}. The corresponding phase diagram in the (d,x) plane is inferred and related to the three-dimensional situation. The two-dimensional Superconductor-to-Insulator Transition well connects with the three-dimensional Superconductor-to-Metal Transition.
@article{arxiv.1408.3673,
title = {Destruction of superconductivity in disordered materials : a dimensional crossover},
author = {O. Crauste and F. Couëdo and L. Bergé and C. A. Marrache-Kikuchi and L. Dumoulin},
journal= {arXiv preprint arXiv:1408.3673},
year = {2015}
}