The resistivity of a series of aluminium strips with thicknesses between 0·017 and 0.95 mm has been measured from 1.6 to 45°k. The bulk resistivity has been obtained by extrapolation to infinite thickness. Appreciable deviation from Matthiessen's rule was found, and it is proposed that this should be explained by a large difference in the scattering cross section for phonon-electron collisions between electron states in the second and in the third Brillouin zone.
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Holwech et al. (1967) studied this question.
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