Evidence of the Vortex-Glass Transition in Homogeneously Disordered Thick Films of a-MoxSi 1-x

We have performed four-terminal ac complex resistivity measurements in the linear regime, as well as dc resistivity measurements, for thick a -Mo x Si 1- x films in constant magnetic fields ( B = 0.1 and 1 T). The critical behavior associated with the second-order transition has been observed for both dc and ac resistivities. This is the first convincing evidence for the vortex-glass transition (VGT) in the homogeneously disordered low- T C superconductors containing microscopic pinning centers. On the basis of this result, together with our previous finding of VGT in granular In films, we conclude that the VGT is universal in type-II superconductors with moderate disorder independent of whether pinning is microscopic or mesoscopic, or whether they are high- T C or low- T C superconductors.