Superconducting Niobium Calorimeter for Studies of Adsorbed Helium Monolayers
Superconducting Niobium Calorimeter for Studies of Adsorbed Helium Monolayers
复制标题
用于研究吸附单层氦的超导铌热量计
DOI：
10.1007/s10909-020-02558-4
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发表时间：
2021
影响因子：
2
通讯作者：
Fukuyama Hiroshi
中科院分区：
文献类型：
--
作者：
Usami Jun;Tokeshi Koki;Matsui Tomohiro;Fukuyama Hiroshi
We developed a calorimeter with a vacuum container made of superconducting niobium (Nb) to study monolayers of helium adsorbed on graphite which are prototypical two-dimensional quantum matters below 1 K. Nb was chosen because of its small specific heat in the superconducting state. It is crucially important to reduce the addendum heat capacity () when the specific surface area of substrate is small. Here we show details of design, construction and results ofmeasurements of the Nb calorimeter down to 40 mK. The measuredwas sufficiently small so that we can use it for heat capacity measurements on helium monolayers in a wide temperature range below 1 K. We found a relatively large excess heat capacity in, which was successfully attributed to atomic tunneling of hydrogen (H) and deuterium (D) between trap centers near oxygen or nitrogen impurities in Nb. The tunnel frequencies of H and D deduced by fitting the data to the tunneling model are consistent with the previous experiments on Nb doped with H or D.
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