Superflow in Helium Films: Third-Sound Measurements
- 24 February 1969
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 22 (8), 338-342
- https://doi.org/10.1103/physrevlett.22.338
Abstract
The results of measurements of third-sound velocity in adsorbed superfluid helium films (1.12-1.85°K) are presented. It is found that the average superfluid fraction is nonvanishing at the superflow onset thickness and has a value about its bulk value. Possible reasons for a nonvanishing value are discussed. Healing lengths based on best fitting Ginzburg-Pitaevskii calculations are determined.
Keywords
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