Abstract
Elastic waves in cubic crystals are considered. A new classification of cubic crystals is proposed based on their elastic properties. All cubic crystals are shown to be divided into crystals with a positive or negative anisotropy of their second-order elastic moduli. The vibrational-branch spectra of crystals of these two types differ qualitatively in shape. The angular dependences of the polarization vectors are analyzed. The transverse component in quasi-longitudinal vibrations in cubic crystals is shown to be small and can be neglected. The longitudinal component in quasi-transverse modes is not small: its maximum value is 16.5% for Ge and reaches 27% for KCl.
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Original Russian Text © I.G. Kuleev, I.I. Kuleev, 2007, published in Fizika Tverdogo Tela, 2007, Vol. 49, No. 3, pp. 422–429.
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Kuleev, I.G., Kuleev, I.I. Elastic waves in cubic crystals with positive or negative anisotropy of second-order elastic moduli. Phys. Solid State 49, 437–444 (2007). https://doi.org/10.1134/S1063783407030079
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DOI: https://doi.org/10.1134/S1063783407030079