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Some Peculiarities of Phonon Scattering by Point Defects in Layered Crystals
Author(s) -
Khadjai G. Ya.,
Merisov B. A.,
Sologubenko A. V.
Publication year - 1997
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(199704)200:2<413::aid-pssb413>3.0.co;2-d
Subject(s) - phonon , condensed matter physics , thermal conductivity , materials science , crystallographic defect , phonon scattering , scattering , flexural rigidity , relaxation (psychology) , dispersion (optics) , optics , physics , composite material , psychology , social psychology
Experimental results of the temperature dependences of phonon thermal conductivity of some layered crystals are analyzed. It is pointed out that the nearly linear temperature dependence of thermal conductivity at low temperature has been observed in crystals with a large number of point defects. The relaxation rates of phonons scattered by static displacement of atoms around point defects are calculated in the frame of a simple model of phonon dispersion, which accounts for the flexural rigidity of the layers. It is shown that the scattering of phonons by point defects lying between layers would cause the experimentally observed temperature dependence of thermal conductivity.