A Simple Experimental Setup for Simultaneous Superfluid-Response and Heat-Capacity Measurements for Helium in Confined Geometries
A Simple Experimental Setup for Simultaneous Superfluid-Response and Heat-Capacity Measurements for Helium in Confined Geometries
复制标题
用于同时测量受限几何结构中氦的超流体响应和热容量的简单实验装置
DOI:
10.1007/s10909-021-02658-9
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发表时间:
2022
影响因子:
2
通讯作者:
Fukuyama Hiroshi
中科院分区:
文献类型:
--
作者:
Usami Jun;Toda Ryo;Nakamura Sachiko;Matsui Tomohiro;Fukuyama Hiroshi
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 of4He 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.
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