Abstract

Thickness dependence of the nonlinear resistivity (J - ρ characteristics) has been measured in various magnetic fields B = 0.05 T – 3 T at temperatures down to 0.5 K for indium films. For the 60 nm-thick film (Film 1), the J - ρ data are analyzed according to the 3D vortex-glass (VG) theory. We have obtained critical exponents and scaling functions, which are similar to those for high-T c superconductors, indicating that the vortex-glass transition is universal in disordered type II superconductors. In contrast, for the thinner film with thickness of 20 nm (Film 2), ρ - J isotherms in fields are markedly different. The J - ρ curves do not show negative curvature down to the lowest temperature and the VG transition temperature T g appears to be zero. This is in accord with the 2D VG theory.

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