Effets de la zone stratifiée de brillouin sur les propriétés électriques des films minces

Abstract
The electrical resistivity, p, and température coefficient of resistivity α, have been measured on films of nickel down to 22 Å thick. At small thicknesses the curves behave as if the mean free path of the material of the film is increased. It seems likelythat this is the result of restrictions imposed by boundary conditions on the component of momentum of the electrons perpendicular to the plane of the films. The Brillouin zones and the Fermi surface will be crossed by planes on which the allowed electron states lie. This alters the small angle scattering by phonons to favor scattering involving no change in the component of momentum perpendicular to the film. This increases the effective mean free path, as regards collisions with the surface. The shapes of the curves are well fitted by employing an effective mean free path proportional to the reciprocal of the thickness, at small thickness.