Abstract
Ultrasonic attenuation and velocity have been measured in Mn${\mathrm{F}}_{2}$ in the vicinity of the N\'eel temperature. Longitudinal and transverse waves were propagated in the [110] and [001] directions. Peaks in the attenuation for longitudinal waves were observed for both directions of propagation. Both peaks occur at the N\'eel temperature and no velocity change at this temperature was observed for any mode of propagation. The data are in qualitative agreement with recent calculations.
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