Quartz Oscillator Study of Monolayer 4He and 3He - 4He Mixture Films Adsorbed on Solid H2 |
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| Authors: | P S Ebey P T Finley R B Hallock |
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| Affiliation: | (1) Laboratory for Low Temperature Physics, Department of Physics and Astronomy, University of Massachusetts, Amherst, MA, 01003, U. S. A. |
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| Abstract: | The superfluid transition in submonolayer and monolayer
4
He films and
3
He -
4
He mixture films on solid H
2
has been studied using a quartz crystal microbalance technique. Kosterlitz-Thouless (KT) transitions were observed in submonolayer
4
He films with density greater than 0.062 ± 0.002 Å
–2
. We determine a binding energy of
4
He to 0.241 Å
–2
H
2
of –15.7 K in the. presence of  1 monolayer of
4
He. At several
4
He coverages, a range of submonolayer
3
He coverages was studied (n
3  0.0567 Å
–2
). With each increase in the
3
He coverage, the KT transition temperature decreased. For the higher coverage mixture films studied (n
4  0.0726 Å
–2
) we observed an apparent second decoupling of the film from the quartz oscillator frequency in addition to the KT transition. We have studied the. coverage dependence of this new feature. |
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| Keywords: | |
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