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VOLUME 21 (1975) | ISSUE 10 | PAGE 578
Effect of condensed phase of excitons on the absorption of ultrasound in germanium
We investigate the absorption of ultrasound by electron-hole drops (EHD) in germanium. We observe that the temperature dependence of the absorption has resonant form with a maximum at T~ 2.4°K. The width of the resonance is ~ 1 °K. Extinction of the EHD luminescence was observed in the field of an ultrasonic wave.