, Volume 3, Issue 4, pp 209–217 | Cite as

Anharmonic relaxation of phonons

  • G P Srivastava


Using the Ziman scheme of considering a drifting Planck’s distribution, as the eigenvector of the linearized phonon collision operator, the anharmonic relaxation of phonons is discussed. The earlier arbitrariness in the phonon-phonon coupling parameters is removed by formulating explicit expressions for different allowed processes in terms of measurable quantities. Low and high temperature approximations of relaxation rates are also discussed: the results differ from earlier calculations. At low temperatures superthermal or high frequency phonons, which have temperature-independent and equal N- and U-relaxation rates, play important roles in thermal conduction in pure insulators.


Anharmonicity lattice thermal conductivity phonon relaxation 


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Copyright information

© the Indian Academy of Sciences 1974

Authors and Affiliations

  • G P Srivastava
    • 1
  1. 1.Physics DepartmentBanaras Hindu UniversityVaranasi

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