Magnetoplasma waves in gallium. Fast magnetoacoustic wave

The results of detailed theoretical and experimental investigations of a fast magnetoacoustic wave (FMAW) in gallium are presented. The wave is excited and detected by electromagnetic or acoustic methods. The FMAW velocity measured for different directions of wave propagation and magnetic field displays a considerable anisotropy associated with peculiar properties of the Fermi surface in gallium. Using the Read model of the electron spectrum of gallium, we calculate numerically the values of the FMAW⨀, velocity along the principal crystallographic axes. The results of the calculations are in qualitative agreement with the experimental data (a quantitative agreement is observed when the Fermi-liquid interaction between charge carriers is taken into account). The strong temperature dependence of the FMAW velocity is discussed and attributed to the considerable difference between the frequencies of intra- and interband relaxation of charge carriers.

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