The magnetoacoustic effect was measured in potassium at temperatures of 1.2-8.5 ^∘{}K. A quantitative comparison with the free-electron theory indicates that the mean free path at higher magnetic fields is effectively 1.1 to 1.25 times larger than at low fields. It is suggested that this deviation is due to the failure of the relaxation-time approximation to give an adequate description of the electron scattering. The temperature dependence of the mean free path was found to be in agreement with resistivity measurements.
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Witt et al. (1970) studied this question.
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