Superfluidity of {sup 4}He films adsorbed on hydrogen plated graphite

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/BF00754589· OSTI ID:198182

Nyeki, J; Ray, R; Maidanov, V ^[1]

---

1. Royal Holloway Univ. of London (United Kingdom); and others

The superfluidity of {sup 4}He on graphite with various preplatings of HD is under investigation using a torsional oscillator. Results for a bilayer of HD follow a similar pattern to those obtained earlier on pure {sup 4}He films and are consistent with third sound measurements on graphite plated with a bilayer of hydrogen. In our case the first {sup 4}He layer solidifies, consistent with behaviour observed in NMR studies of {sup 3}He on a similarly prepared substrate. At a coverage of 11 nm{sup -2} there is the onset of a region in which the transition temperature increases rapidly with coverage and the transition itself becomes sharper. At certain coverages pronounced signatures have been observed in the period shift and dissipation, which may indicate a further phase transition in the film at lower temperatures.

• Sponsoring Organization: USDOE
• OSTI ID: 198182
• Report Number(s): CONF-950676--
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 1-2 Vol. 101; ISSN 0022-2291; ISSN JLTPAC
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
GRAPHITE
HELIUM 4
HYDROGEN
NUCLEAR MAGNETIC RESONANCE
SUPERFLUIDITY
TEMPERATURE DEPENDENCE