Abstract
The transport properties of large wave vector near zone boundary transverse acoustic phonons in solids has attracted a good deal of experimental attention over the last few years.[1] In order to explain the long energy relaxation times for phonons of energy ħω>kT, LAX, HU and NARAYANAMURTI[2] showed that irrespective of crystal anharmonicity, anisotropy and symmetry a phonon of a given phase velocity cannot decay into phonons of higher phase velocity. The theorem applies to both N and U processes.
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References
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© 1984 Springer-Verlag Berlin Heidelberg
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Haavasoja, T., Narayanamurti, V., Chin, M.A. (1984). Propagation of Near Zone Boundary Acoustic Phonons in Solid (hcp) 4He. In: Eisenmenger, W., Laßmann, K., Döttinger, S. (eds) Phonon Scattering in Condensed Matter. Springer Series in Solid-State Sciences, vol 51. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-82163-9_20
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DOI: https://doi.org/10.1007/978-3-642-82163-9_20
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