Abstract
Alfv\'en-wave propagation in parallel-plate Bi samples has been studied using a 24-GHz microwave reflection spectrometer. The attenuation of Alfv\'en-wave amplitudes in a magnetic field up to 10 kG was measured at different temperatures ranging from 2.4 to 11 \ifmmode^\circ\else\textdegree\fi{}K. From the amplitude of the weakly damped waves, effective relaxation times of charge carriers were measured directly without using any band-structure parameter. The temperature dependence of the effective relaxation times can be fitted to a ${T}^{\ensuremath{-}2}$ variation with different slopes for different crystal orientations.
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