Year: 2010
Type: article
Abstract: We use the thermomechanical effect to confirm that a flux of atoms takes place in hcp solid $^{4}\mathrm{He}$ below $\ensuremath{\sim}600\text{ }\text{ }\mathrm{mK}$. We find that the flux falls abruptly in the vicinity of 80 mK and rises with further reduction of temperature. Samples freshly made at 60 mK do not allow mass flux and cannot be grown off the melting curve even when raised in temperature to 200 mK. Solids created above $\ensuremath{\sim}300\text{ }\text{ }\mathrm{mK}$ and cooled to 60 mK can be grown further and demonstrate finite mass flux.
Source: Physical Review Letters
Authors: M. W. Ray, R. B. Hallock
Institution: University of Massachusetts Amherst
Language: Latvian
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1504999536