ln T Term and Magnetic Field Effect in Conductivity of Ni Thin Film

Temperature and magnetic field dependence of conductivity in highly resistive thin film of Ni was measured at low temperatures. Conductivity varied as σ 0 + A ln T , where A was very close to \(e²/2{π}²\). Magnetoconductivity was positive, temperature-independent and as small as 0.1 % in 10 kOe. It was isotropic with the direction of magnetic field for the film of 60 A thick, while in 40 A film an anisotropy was observed.