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Attenuation of High-Frequency Acoustic Waves on the Low-Temperature Side of the Mn F 2 Néel Point

1973; American Physical Society; Volume: 30; Issue: 13 Linguagem: Inglês

10.1103/physrevlett.30.617

1092-0145

A. Bachellerie, J. Joffrin, A. Levelut,

Geomagnetism and Paleomagnetism Studies

We present acoustic-attenuation experiments at frequencies up to 1000 MHz in the vicinity of the N\'eel point of Mn${\mathrm{F}}_{2}$. They show that the attenuation is maximum in the low-temperature phase near the transition, and the temperature at which that maximum appears decreases as the frequency increases. A brief scanning of the theory is given which explains this new effect in terms of relaxation of staggered magnetization.