Peculiarities of sound attenuation in noncollinear antiferromagnets
V. G. Bar’yakhtarPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskV. G. BelykhPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskI. M. VitebskiĭPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskT. K. SobolevaPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, Donetsk
ABI
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It is shown that the magnetoelastic interaction in the exchange relaxation processes is responsible for sound attenuation in spin subsystems. It is found that in a four-sublattice antiferromagnet UO2 the damping decrement of the low-frequency sound is described by the same phenomenological constant as the damping of the exchange branch of the spin wave spectrum.
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