Ultrasonic attenuation near the critical point of MnF(2)
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Ultrasonic attenuation and velocity have been measured in MnF(2) in the vicinity of the Neel temperature. Longitudinal and transverse waves were propagated in the  and  directions. Peaks in the attenuation for longitudinal waves were observed for both directions of propagation. Both peaks occur at the Neel temperature and no velocity change was observed for any mode of propagation. The data are in qualitative agreement with recent calculations.
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