Abstract
We report thermal conductivity measurements of two hcp H2 crystals over a temperature range between 0.15 and 1.6 K and an ortho-H2 concentration range betweenX=0.55 andX=0.01. The orientation of the crystals in the conductivity cell was determined from the anisotropy of the NMR spectrum forX≈0.01. The conductivity results are analyzed into contributions from (1) phonon scattering by the rotational states of the ortho-H2 particles and (2) boundary phonon scattering. The results are compared with previous work at higher temperatures. The influence of ortho-H2 clustering on the thermal conductivity is observed and discussed.
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Calkins, M., Meyer, H. Thermal conductivity of solid ortho-para H2 mixtures below 1.6 K. J Low Temp Phys 57, 265–282 (1984). https://doi.org/10.1007/BF00681192
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DOI: https://doi.org/10.1007/BF00681192