Torsional Oscillator Study of Thin Helium Films on Hydrogen Substrates

Daryl Tulimieri; Norbert Mulders; Moses H.W. Chan

doi:10.1023/a:1022583505766

Torsional Oscillator Study of Thin Helium Films on Hydrogen Substrates

Daryl Tulimieri, Norbert Mulders, Moses H.W. Chan

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19 Scopus citations

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 ρ_s or the dissipation in the film that can be identified with a second transition reported in recent third sound experiments.

Original language	English (US)
Pages (from-to)	609-614
Number of pages	6
Journal	Journal of Low Temperature Physics
Volume	110
Issue number	1-2
DOIs	https://doi.org/10.1023/a:1022583505766
State	Published - Jan 1 1998

All Science Journal Classification (ASJC) codes

Atomic and Molecular Physics, and Optics
General Materials Science
Condensed Matter Physics

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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 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.",

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AU - Mulders, Norbert

AU - Chan, Moses H.W.

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Y1 - 1998/1/1

N2 - 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.

AB - 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.

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Torsional Oscillator Study of Thin Helium Films on Hydrogen Substrates

Abstract

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