T. Paszkiewicz et M. Pruchnik, Polarization vectors of acoustic phonons propagating in mechanically stable anisotropic media, J L TEMP PH, 122(3-4), 2001, pp. 467-474
We consider properties of long wavelength acoustic phonons propagating in a
nisotropic elastic media. For cubic media we found three subregions of mech
anical stability region in which polarization properties of modes are anoma
lous. To achieve the detailed specification of this unusual behavior we per
formed vast numerical calculations and devised new characteristics, namely
surfaces of polarization angles and maps of polarization enhancement factor
s.