论文标题
基于金属顺磁温度传感器的新型量热法设置的开发
Development of a novel calorimetry setup based on metallic paramagnetic temperature sensors
论文作者
论文摘要
我们已经开发了一个新的微型制造平台，用于测量低热容量MG大小的金属样品（例如超导体）的特定热量，低至$ 10 \，\ MATHRM {MK} $。它解决了此类设置的具有挑战性的方面，例如样品和平台之间的热接触，温度计分辨率和附录热容量超过了感兴趣的样品（通常为$ \ mbox {nj/k at} 20 \，\ mbox，\ mbox {mk} $）。该设置允许我们使用松弛方法，在该方法中，监测了定义良好的热脉冲后的热放松以提取特定的热量。样本平台（$ 5 \ times 5 \，\ mathrm {mm^2} $）包括一个微结构的pragagnetic \ lisesline {ag}：er温度传感器，通过DC-Squid通过超导电磁通变压器读出。这样，可以达到$ 30 \，\ mathrm {nk/\ sqrt {hz}} $的相对温度精度，而Addenda热容量远低于$ 0.5 \，\ Mathrm {nj/k} $ for $ t <300 \，\ 300 \，\，\ Mathrm {mk} $。包括金色涂层的安装区（$ 4.4 \ times 3 \，\ Mathrm {mm^2} $），以改善样品和平台之间的热接触。
We have developed a new micro-fabricated platform for the measurement of the specific heat of low heat capacity mg-sized metallic samples, such as superconductors, down to temperatures of as low as $10\,\mathrm{mK}$. It addresses challenging aspects of setups of this kind such as the thermal contact between sample and platform, the thermometer resolution, and an addenda heat capacity exceeding that of the samples of interest (typically $\mbox{nJ/K at }20\,\mbox{mK}$). The setup allows us to use the relaxation method, where the thermal relaxation following a well defined heat pulse is monitored to extract the specific heat. The sample platform ($5 \times 5\, \mathrm{mm^2}$) includes a micro-structured paramagnetic \underline{Ag}:Er temperature sensor, which is read out by a dc-SQUID via a superconducting flux transformer. In this way, a relative temperature precision of $30\,\mathrm{nK/\sqrt{Hz}}$ can be reached, while the addenda heat capacity falls well below $0.5\,\mathrm{nJ/K}$ for $T < 300\,\mathrm{mK}$. A gold-coated mounting area ($4.4 \times 3 \, \mathrm{mm^2}$) is included to improve the thermal contact between sample and platform.
