Influence by trajectorial electron transport on anomalous ultrasound attenuation in high pure Gallium single crystal

TL;DR

This study investigates how trajectorial electron transport influences anomalous ultrasound attenuation in high purity Gallium, revealing new magneto-acoustic effects and electron-phonon collision dynamics at low temperatures.

Contribution

It presents experimental evidence of magneto-acoustic effects linked to electron transport and collision frequencies in high purity Gallium at low temperatures.

Findings

Detection of delayed ultrasonic signals indicating electron transport effects.

Observation of anomalous oscillations in ultrasonic velocity related to magnetic field orientation.

Identification of temperature dependence of electron-phonon collision frequency.

Abstract

The anomalous propagation of longitudinal ultrasound with the frequencies of 70 and 150 MHz in the high pure Gallium single crystal at the weak external magnetic field (the magnetic field H perpendicular to the wave vector k) at the low temperature of 0.4 K was researched experimentally. The delayed ultrasonic signal, comparing to the main ultrasonic signal, is detected. The research on the new magneto-acoustic effects made it possible to find the temperature dependence of the frequency of collisions between the electrons and the thermal phonons in the high pure Gallium single crystal. It is found that the anomalous oscillations of propagation velocity of ultrasonic signal pulses and the signals, propagating by the way of the electron transport in the high pure type I superconductor, can be detected at the directions of the magnetic field H close to the magnetic field H parallel to the wave vector k.