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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Ebey, P.S., Finley, P.T. & Hallock, R.B. Quartz Oscillator Study of Monolayer 4He and 3He - 4He Mixture Films Adsorbed on Solid H2 . Journal of Low Temperature Physics 110, 635–640 (1998). https://doi.org/10.1023/A:1022591707583
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DOI: https://doi.org/10.1023/A:1022591707583