Abstract:
A general method is proposed for determining the frequency and damping of the lattice vibrations
ofananharmonic ferromagnetic crystal. An exact equation is derived for the irreducible
Green's functions; it describes the propagation of self-consistent phonons and the inelastic
processes of scattering of these phonons due to the effective phonon-phonon and spin-phonon
interactions, The self-energy operator is calculated with allowance for the three-phonon scattoting
processes.
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