The thermal conductivity of solid CO was investigated in the temperature range 1–20 K. The experimental
temperature dependence of thermal conductivity of solid CO was described using the time-relaxation method within the Debye model. The comparison of the experimental temperature dependences of the thermal conductivity of N2 and CO shows that in the case of CO there is an additional large phonon scattering at temperatures near the maximum. The analysis of the experimental data indicates that this scattering is caused by the frozen disordered dipole subsystem similar to a dipole glass. The scattering is described by the
resonant phonon scattering on tunnelling states and on low-energy quasi-harmonic oscillations within the
soft potential model.
PACS: 63.20–e Phonons in crystal lattices; PACS: 66.70.–f Nonelectronic thermal conduction and heat-pulse propagation in solids; thermal waves; PACS: 44.10.+i Heat conduction.