Abstract
We have made torsional oscillator measurements of thin helium films on a Mylar surface preplated with 2 and 5 layers of H2. The minimum 4He coverage needed for superfluidity, or "inert" layer, n0 on both surfaces is found to be 6 μmole/m2. This is equivalent to 1/2 of a monolayer at bulk liquid density. The superfluid transition in coverages above n0 is similar to that found on bare Mylar, exhibiting the standard Kosterlitz-Thouless characteristics. We find no anomaly in ρs or the dissipation in the film that can be identified with a second transition reported in recent third sound experiments.
Original language | English (US) |
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Pages (from-to) | 609-614 |
Number of pages | 6 |
Journal | Journal of Low Temperature Physics |
Volume | 110 |
Issue number | 1-2 |
DOIs | |
State | Published - Jan 1 1998 |
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- General Materials Science
- Condensed Matter Physics