Condensed Matter Physics, 2006, vol. 9, No. 4(48), p. 709-718, English

Title: Phonon scattering and heat transfer by "diffusive" modes in solid C6H6
  O.I.Pursky (Taras Shevchenko National University of Kyiv, Faculty of Physics, 6 Glushkova Ave., Kyiv 03022, Ukraine) ,
  V.A.Konstantinov (Institute for Low Temperature Physics and Engineering of the National Academy of Science of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine)

The isochoric thermal conductivity of solid C6H6 is described within a model in which the heat is transferred by phonons and above the phonon mobility edge by "diffusive" modes migrating randomly from site to site. The mobility edge ω 0 is found from the condition, that the phonon mean-free path restricted by the examined mechanisms of scattering cannot become smaller than half the wavelength. The contributions of phonon-phonon, one and two-phonon scattering to the total thermal resistance of solid C6H6 are calculated under the assumption of additive contribution of different scattering mechanisms. Significant deviations from the dependence Λ ∝1/T are explained by thermal conductivity approaching its lower limit.

Key words: molecular crystals, heat transfer, phonons, librons
PACS: 66.70+f, 63.20.Ls

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