Abstract
We report the results of flow experiments in which two chambers containing solid are connected by a superfluid Vycor channel. At low temperatures and pressures, mechanically squeezing the solid in one chamber produced a pressure increase in the second chamber, a measure of mass transport through our solid-superfluid-solid junction. This pressure response is very similar to the flow seen in recent experiments at the University of Massachusetts: it began around 600 mK, increased as the temperature was reduced, then decreased dramatically at a temperature, , which depended on the impurity concentration. Our experiments indicate that the flow is limited by mass transfer across the solid-liquid interface near the Vycor ends, where the collects at low temperature, rather than by flow paths within the solid .
- Received 6 February 2015
DOI:https://doi.org/10.1103/PhysRevLett.114.165301
© 2015 American Physical Society