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Title:Superfluid helium on solid hydrogen
Author(s):Chen, Ming-Tang
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.
Issue Date:1993
Rights Information:Copyright 1993 Chen, Ming-Tang
Date Available in IDEALS:2011-05-07
Identifier in Online Catalog:AAI9411583
OCLC Identifier:(UMI)AAI9411583

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