The limits of applicability are established for the different decoupling procedures in the Green's function equations of the spin system of an Heisenberg ferromagnet.
In the random phase approximation the imaginary part of the phonon polarization o,mrator is calculated in the left vicinity of the Curie point as well aa the renormalization of the sound velocity due to the spin-phonon interaction of exchange origin in a cubic ferrodielectric.
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