Magnitude of the effect of anomalous penetration of ultrasound along electron trajectories in a magnetic field in pure gallium

The frequency dependence of the effect of anomalous penetration of longitudinal ultrasound (for H⊥k∥b axis of gallium) is investigated experimentally at a temperature of 1.1°K in the frequency range from 30 to 150 MHz. An analysis of the processes taking place in the metal under anomalous penetration conditions and measurements of the electron absorption of ultrasound in superconducting gallium down to a temperature of 0.32 °K make it possible for the first time to estimate the “transport coefficient” of longitudinal ultrasound along electron trajectories: Aprec/Ama≈0.01.

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