Phonon Scattering by Isotopic Impurities in Helium Single Crystals
We have utilized the enhancement of thermal conductivity by Poiseuille flow of the phonon gas to study phonon scattering in 4He crystals containing small amounts of 3He. Our samples differed from those of previous investigations in two respects: (1) they were single crystals of high quality, and (2) the 3He concentrations studied were quite small, the largest being 2.0 × 10 −5.
KeywordsAnisotropy Helium Hexagonal Lawson Berman
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