Interaction of second sound with acoustic waves in solids

Viswanathan, K. S. (1986) Interaction of second sound with acoustic waves in solids Pramana - Journal of Physics, 27 (1-2). pp. 307-320. ISSN 0304-4289

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An expression has been derived for the collision operator for phonons in a solid, which is valid at very low temperatures. The set of coupled equations for the elastic deformation and the phonon density or second sound has been reduced to a simple tractable form and the dispersion equation for the coupled waves consisting of the acoustic modes and second sound has been derived. It is shown that only the longitudinal mode interacts with the second sound. It is also shown that as a result of the interaction with the second sound, the longitudinal velocity along the principal axis acquires a correction term that is proportional to both ϒ2 and T4.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Second Sound; Acoustic Waves; Phonons; Two-fluid Equations; Collision Operator
ID Code:68847
Deposited On:07 Nov 2011 04:43
Last Modified:18 May 2016 15:30

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