Abstract
The electromagnetic transparency of high-purity gallium single crystals at zero magnetic field is investigated at temperatures of 1.7–4.2K. Under conditions of strong temporal dispersion beam electromagnetic waves are observed which are due to electrons from the flattenings of the Fermi surface. The velocities, damping, moduli, and initial phases of the excitation coefficients are measured and the frequency dependence of the damping and the dependence of the phase velocity on the relaxation time are obtained. Beam waves, unlike ballistic (quasiwave) transport of electromagnetic field, are characterized by the presence of Landau damping and significant decrease of the phase velocity with decreasing relaxation time.
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