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|Title:||Superfluid helium on solid hydrogen|
|Doctoral Committee Chair(s):||Mochel, J.M.|
|Department / Program:||Physics|
|Degree Granting Institution:||University of Illinois at Urbana-Champaign|
|Subject(s):||Physics, Condensed Matter|
|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.
|Rights Information:||Copyright 1993 Chen, Ming-Tang|
|Date Available in IDEALS:||2011-05-07|
|Identifier in Online Catalog:||AAI9411583|