Magnetoresistance and Boundary Scattering in Ballistic Wires
Boundary scattering has long been known to influence the magnetoresistance of very thin metal wires and films . In carefully prepared films the electron mean free path at low temperatures can be much larger than the thickness of the film and the electrons are scattered frequently by the surfaces. In a metal, the Fermi wavelength is of the order of the atomic spacing and unless great care is taken to ensure that the surfaces are very smooth the boundary scattering is predominantly diffuse i.e. momentum parallel to the surface is not conserved.
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