A Simple Experimental Setup for Simultaneous Superfluid-Response and Heat-Capacity Measurements for Helium in Confined Geometries

Jun Usami, Ryo Toda, Sachiko Nakamura, Tomohiro Matsui, Hiroshi Fukuyama

研究成果: ジャーナルへの寄稿学術誌査読

1 被引用数 (Scopus)

抄録

Torsional oscillator (TO) is an experimental technique which is widely used to investigate superfluid responses in helium systems confined in porous materials or adsorbed on substrates. In these systems, heat capacity (HC) is also an important quantity to study the local thermodynamic properties. We have developed a simple method to incorporate the capability of HC measurement into an existing TO without modifying the TO itself. By inserting a rigid thermal isolation support made of alumina and a weak thermal link made of fine copper wires between a standard TO and the mixing chamber of a dilution refrigerator in parallel, we were able to carry out simultaneous TO and HC measurements on exactly the same helium sample, i.e., four atomic layers of 4He adsorbed on graphite, with good accuracies down to 30 mK. The data reproduced very well the previous workers’ results obtained independently using setups optimized for individual measurements. This method is conveniently applicable to a variety of experiments where careful comparisons between results of TO and HC measurements are crucial. We describe how to design the thermal isolation support and the weak thermal link to manage conflicting requirements in the two techniques.

本文言語英語
ページ(範囲)457-466
ページ数10
ジャーナルJournal of Low Temperature Physics
208
5-6
DOI
出版ステータス出版済み - 9月 2022
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 原子分子物理学および光学
  • 材料科学一般
  • 凝縮系物理学

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