Abstract
The transverse ultrasonic attenuation due to spin fluctuations m magnetic metals is theoretically studied. Spin fluctuations with finite wave numbers cause the critical attenua· tion at the Nee! temperatures, but the ferromagnetic spin fluctuation does not. The ratio of the attenuation coefficient for transverse sound to that for longitudinal sound near the Nee! temperature is given as a function of (i) the directions of sound propagation and polarization relative to the Q vector and (ii) Q/2Pt, where Q is the wave number at which the spin ordering occurs below the Nee! temperature and p1 is the Fermi wave number of electron. The critical attenuation in MnSi observed by Komatsubara et al. is discussed in the light of the present theory.
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