Changes in dissipative properties of high-resistance CdS samples under the action of light and ultrasound are studied. Passage from darkness to light causes a jump change in the strain amplitude $\varepsilon^0$ in a standing ultrasonic wave and in the internal friction $Q^{-1}$ of the samples. Depending on the initial state, the response to illumination can be both positive (an increase in $\varepsilon^0$ and a decrease in $Q^{-1}$) and negative (a decrease in $\varepsilon^0$ and an increase in $Q^{-1}$). The action of ultrasound causes changes in $\varepsilon^0$ and $Q^{-1}$ jump values. The dissipative properties of CdS are discussed in relation to CdS cathodoluminescence spectra.
Department of Molecular Physics and Physical Measurements, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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