Torsional oscillator experiments with high stability and reproducibility

We report experiments of the torsional oscillator to observe the superfluid transition in super(4)He films in porous glass (the pore diameter is 1 mu m). Stability and reproducibility of the oscillator, which quite often is problematic in previous experiments, is essential for a quantitative analysi...

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Bibliographic Details
Published inJournal of low temperature physics Vol. 113; no. 3-4; pp. 423 - 428
Main Authors Fukuda, Muneyuki, Ooyama, Kazunari, Obata, Toshiaki, Kovacik, Vladimir, Kubota, Minoru
Format Journal Article
LanguageEnglish
Published 01.11.1998
Subjects
Energy dissipation
Friction
Glass
Oscillations
Phase transitions
Porous materials
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Summary:We report experiments of the torsional oscillator to observe the superfluid transition in super(4)He films in porous glass (the pore diameter is 1 mu m). Stability and reproducibility of the oscillator, which quite often is problematic in previous experiments, is essential for a quantitative analysis of observations in different conditions. It follows that the friction of the superfluid films and the energy dissipation of the solid films are derived from comparisons of measurements for different film thickness.
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ISSN:0022-2291
DOI:10.1023/a:1022591826335