Abstract
The thermal conductivity of3He–4He solutions at saturated vapor pressure has been measured for the concentration range 0.011–1.3 mole %3He and the temperature range 84–650 mK. Measurements were made at 10 and 24 atm for several of the concentrations. The thermal conductivity of solutions at 24 atm does not differ greatly from the thermal conductivity of pure4He at this pressure. Qualitative agreement with the Baym and Ebner theory is achieved only if the boundary scattering of phonons is treated in a different manner than suggested by them.
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