Landau and Rumer (1937) have considered the attenuation resulting from a particular three phonon process involving a shear acoustic phonon, and have shown that the attenua- tion coefficient should have the form I' = A w T^4 ; where r is the attenuation coefficient, w relates to the acoustic wave, T is the temperature and A is a function of the elastic anharmonicity of the material under investigation.
\cite{price_acoustic_1971} \cite{landau_absorption_1937}
#a-Si
##cond AF GK-normand
##diff N0=3 (216 atoms) N0=5 (1000 atoms)
###N0=3
###N0=5
