Resonance absorption of ultrasound in cadmium and zinc

Doppler-shifted cyclotron resonance DSCR is investigated in the absorption of longitudinal and transverse ultrasound propagating along the [0001] axis in cadmium and zinc. It is found that in Cd DSCR of transverse ultrasound and holes of the “monster” manifests itself in the second band at low frequencies in the form of an anomaly of the “Kjeldaas edge” type, which transforms with increasing frequency into an asymmetric peak typical of strain interaction of the electronic and ionic subsystems. On the other hand, harmonic DSCR is observed over the entire frequency range in the form of distinct asymmetric peaks. Another consequence of DSCR is studied experimentally in cadmium, namely Doppler-phonon resonance, which is induced by the excitation of a hole doppleron. The results are in good agreement with the theoretical and existing experimental data on the electromagnetic spectrum of cadmium. In zinc, along with the absorption peak associated with DSCR of sound and electrons of the reference point of the “lens” in the third band, a series of oscillations is observed, which are periodic in the inverse magnetic field and set in for considerably larger fields (≳ 20 kOe) in transverse ultrasound than in the longitudinal mode (≳ 6 kOe). The frequency and angular variations of the oscillations exhibit a linear behavior and are highly consistent with the hypothesis that these oscillations are the result of interference between electron wave packets due to magnetic breakdown between the first and second bands.

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