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• W2902180155 abstract "A number of experiments have shown that mass can be transported through solid $^{4}mathrm{He}$ at temperatures as low as 16 mK, with features that suggest superflow. But the nature of this flow remains unclear. The Fermi isotope $^{3}mathrm{He}$ provides the possibility of a direct comparison to a solid in which quantum effects are even more important but superfluidity is not expected. We have made flow measurements on high purity bcc $^{3}mathrm{He}$, using the same cell in which we observed a superfluidlike response in hcp $^{4}mathrm{He}$ when pressure differences were applied. We observed flow but, in marked contrast to $^{4}mathrm{He}$, it decreased monotonically with temperature. Near melting, the flow was thermally activated with an energy of 0.85 K, but some flow remained even at 30 mK. The flow rates in the solid were essentially constant below 100 mK, even in low density samples that remelted at low temperatures. The very different behaviors of solid $^{3}mathrm{He}$ and $^{4}mathrm{He}$ support the interpretation of superflow in $^{4}mathrm{He}$. Although such superflow is not possible in $^{3}mathrm{He}$, the temperature-independent flow below 100 mK indicates that the flow in this regime also has a quantum origin. The flow must involve defects and, based on the magnitude of the flow and comparisons to other experiments, we conclude that in both the thermal and the quantum regimes the flow involves motion of dislocations via thermally activated or tunneling motion of kinks." @default.
• W2902180155 created "2018-12-11" @default.
• W2902180155 creator A5052960597 @default.
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• W2902180155 date "2018-11-29" @default.
• W2902180155 modified "2023-09-25" @default.
• W2902180155 title "Mass Flow through Solid He3 in the bcc Phase" @default.
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• W2902180155 doi "https://doi.org/10.1103/physrevlett.121.225304" @default.
• W2902180155 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30547618" @default.
• W2902180155 hasPublicationYear "2018" @default.
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