Torsional Oscillator Study of Thin Helium Films on Hydrogen Substrates |
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| Authors: | Daryl Tulimieri Norbert Mulders Moses H W Chan |
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| Affiliation: | (1) Department of Physics, Pennsylvania State University, University Park, PA, 16802, USA;(2) Present address: Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA |
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| Abstract: | We have made torsional oscillator measurements of thin helium films on a Mylar surface preplated with 2 and 5 layers of H
2
. The minimum
4
He coverage needed for superfluidity, or  inert layer, n
o
on both surfaces is found to be 6  mole/m
2
. This is equivalent to 1/2 of a monolayer at bulk liquid density. The superfluid transition in coverages above n
o
is similar to that found on bare Mylar, exhibiting the standard Kosterlitz-Thouless characteristics. We find no anomaly in 
s
or the dissipation in the film that can be identified with a second transition reported in recent third sound experiments. |
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