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Lattice thermal conductivity of solid helium crystals
Author(s) -
Pal S. K.,
Kumar A.
Publication year - 1987
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/pssb.2221400209
Subject(s) - phonon , vacancy defect , helium , condensed matter physics , thermal conductivity , scattering , dislocation , materials science , phonon scattering , conductivity , physics , atomic physics , optics , quantum mechanics , composite material
Vacancy like excitations are suggested for solid helium which can be scattered due to the vacancy–phonon interaction processes. The phonon conductivity of solid helium is analysed by modifying Callaway's expression for high frequency phonons and for Poiseuille's flow of phonons. An excellent agreement between theory and experiment is obtained when the combination of static and dynamic dislocation scattering processes is considered as an effective dislocation scattering of phonons.