Low Temperature Physics: 35, 343 (2009); https://doi.org/10.1063/1.3117966 (5 pages)
Fizika Nizkikh Temperatur: Volume 35, Number 4 (April 2009), p. 442-447    ( to contents , go back )

The influence of the disordered dipole subsystem on the thermal conductivity of the CO solid at low temperatures

V. Sumarokov

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: sumarokov@ilt.kharkov.ua

A. Jeżowski and P. Stachowiak

W. Trzebiatowski Institute of Low Temperature and Structure Research of Polish Academy of SciencesP.O. Box 1410, 50-950 Wroclaw, Poland
E-mail: a.jezowski@int.pan.wroc.pl;
p.stachowiak@int.pan.wroc.pl

pos Анотація:

Received January 4, 2009

Abstract

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.

Key words: thermal conductivity, heat transfer, molecular cryocrystals, dipolar disordered system.

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