Destruction of superconductivity in disordered materials : a dimensional   crossover
  The disorder-induced Superconductor-to-Insulator Transition in amorphous Nb$_{x}$Si$_{1-x}$ 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 $d_c$, 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. 
O. Crauste, F. Cou\"edo, L. Berg\'e, C.A. Marrache-Kikuchi, and L.   Dumoulin (CSNSM, University Paris-Sud)
cond-mat.supr-con