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https://hdl.handle.net/2142/23036
Description
Title
Superfluid helium on solid hydrogen
Author(s)
Chen, Ming-Tang
Issue Date
1993
Doctoral Committee Chair(s)
Mochel, J.M.
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Date of Ingest
2011-05-07T13:59:50Z
Keyword(s)
Physics, Condensed Matter
Language
eng
Abstract
We measure the third sound velocity of superfluid helium films as functions of temperature and film coverage on H$\sb2,$ D$\sb2,$ and Ar substrates. A new phase of superfluid is discovered on the weak-binding H$\sb2$ substrate. We observe, in addition to third sound, a new surface mode of wave propagation in superfluid films. On a D$\sb2$ substrate, we observe a similar phase diagram as on H$\sb2,$ though only the third sound mode is seen.
The measurement of the third sound velocity as a function of coverage in the T = 0K limit is in close agreement with the results from two independent theoretical models. The measured third sound velocity is analyzed to yield a Van der Waals constant and an inert layer for $\sp4$He on H$\sb2$ of 13.1 $\pm$ 8 K $\cdot$ Layer$\sp3$ and 0.34 $\pm$ 0.09 Layers, respectively. These values are compared to our previous results, and the results from other groups.
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