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VOLUME 41 (1985) | ISSUE 11 | PAGE 466
Low-temperature anomaly of the velocity of ultrasound in Pb0.75Sn0.25Te(In)
A new method of studying the acoustic properties of semiconductors, which is based on direct conversion of electromagnetic and ultrasonic waves, is proposed. At Γ~ 20 К an indium-doped lead-tin telluride exhibits an anomalous feature in the velocity of longitudinal ultrasound. This anomaly is caused by the transition of the crystal to the ferroelectric phase.