Geodesic
Phonons in a~ferromagnetic crystal
Teoretičeskaâ i matematičeskaâ fizika, Tome 8 (1971) no. 1, pp. 119-129

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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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     author = {H. Konwent and N. M. Plakida},
     title = {Phonons in a~ferromagnetic crystal},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {119--129},
     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1971_8_1_a11/}
}
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H. Konwent; N. M. Plakida. Phonons in a~ferromagnetic crystal. Teoretičeskaâ i matematičeskaâ fizika, Tome 8 (1971) no. 1, pp. 119-129. http://geodesic.mathdoc.fr/item/TMF_1971_8_1_a11/