Effects of 4He Film on Quartz Tuning Forks in 3He at Ultra-low Temperatures

T. S. Riekki*, J. Rysti, J. T. Mäkinen, A. P. Sebedash, V. B. Eltsov, J. T. Tuoriniemi

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)
58 Downloads (Pure)


In pure superfluid 3He–B at ultra-low temperatures, the quartz tuning fork oscillator response is expected to saturate when the dissipation caused by the superfluid medium becomes substantially smaller than the internal dissipation of the oscillator. However, even with a small amount of 4He covering the surfaces, we have observed saturation already at significantly higher temperatures than anticipated, where we have other indicators to prove that the 3He liquid is still cooling. We found that this anomalous behavior has a rather strong pressure dependence, and it practically disappears above the crystallization pressure of 4He. We also observed a maximum in the fork resonance frequency at temperatures where the transition in quasiparticle flow from the hydrodynamic to the ballistic regime is expected. We suggest that such anomalous features derive from the superfluid 4He film on the oscillator surface.

Original languageEnglish
Pages (from-to)73-81
Number of pages9
JournalJournal of Low Temperature Physics
Issue number1-2
Early online date1 Jan 2019
Publication statusPublished - 15 Jul 2019
MoE publication typeA1 Journal article-refereed


  • Helium-3
  • Helium-3–Helium-4 mixture
  • Helium-4 film
  • Quartz tuning fork


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