Thermal conductivity of solid parahydrogen with methane admixtures

Details Thermal conductivity of solid parahydrogen with methane admixtures Thermal conductivity of solid parahydrogen with methane admixtures

2002-12-28

arxiv.org/abs/cond-mat/0212618v1

Physics

Condensed Matter

Materials Science

9 pages. to be published in LTP (2003)

Scientific paper

10.1063/1.1582336

The thermal conductivity of solid parahydrogen crystal with methane admixtures has been measured in the temperature range 1.5 to 8 K. Solid samples were grown from the gas mixture at 13 K. Concentration of CH4 admixture molecules in the gas varied form 5 to 570 ppm. A very broad maximum of thermal conductivity with absolute value of about 110 W/(m K) is observed at 2.6 K. The data are interpreted by Callaway model considering phonons resonant scattering on quasi-local vibrations of CH4 molecules, phonon-grain boundary and phonon-phonon scattering processes. The increase of grain boundary scattering leads to the decrease of the maximum broadening. The analysis shows that the solid mixture of p-H2 and CH4 is a heterogeneous solution for CH4 concentration higher than 0.1 ppm.

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