Electron-electron interaction effect on conductivities in cobalt thin films

We have measured the temperature (T) dependence of the conductivity of cobalt films with various thickness (d). The conductivity shows In T dependence for d < 100 Angstrom, which is mainly caused by electron-electron interaction effect. The coefficient of the In T dependence significantly decreases with decreasing thickness for d < 50 Angstrom, where the conductivity approaches Mooij limit. The results suggest that the scattering for d < 50 Angstrom is dominated by the inhomogeneity of the films such as grain boundaries. (C) 2003 Elsevier Science B.V. All rights reserved.