Title: Phonon scattering and heat transfer by "diffusive" modes in solid C₆H₆
Author(s):

	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