We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Flow of Solid <sup>4</sup>He Near Melting.
- Authors
James Day; John Beamish
- Abstract
Abstract  Torsional oscillator measurements on solid 4He have demonstrated non-classical rotational inertia (NCRI), indicative of a supersolid phase transition. Recent experiments indicate that the NCRI fraction depends on isotopic purity and perhaps on details of crystal growth and annealing, suggesting that defects may be involved. Our recent experiments have shown that solid helium does not flow in response to pressure gradients at low temperatures. Close to the melting temperature we do observe mass flow, but it decreases rapidly with temperature. For solid helium in the pores of Vycor the flow appears to be thermally activated and disappears below about half the melting temperature. Flow in bulk helium is restricted to a much narrower temperature range. Very close to melting (within 20 mK) the flow completely eliminates pressure differences in less than a minute. At slightly lower temperatures we saw flow, but significant pressure differences remained even after annealing.
- Subjects
HELIUM at low temperatures; PHASE transitions; PHASE equilibrium; TEMPERATURE measurements
- Publication
Journal of Low Temperature Physics, 2007, Vol 148, Issue 5/6, p683
- ISSN
0022-2291
- Publication type
Article
- DOI
10.1007/s10909-007-9427-5