Development of a novel calorimetry setup based on metallic paramagnetic temperature sensors.
Development of a novel calorimetry setup based on metallic paramagnetic temperature sensors.
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DOI：
10.1063/1.5139090
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发表时间：
2020-03
期刊：
影响因子：
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通讯作者：
A. Reifenberger;A. Reiser;S. Kempf;A. Fleischmann;C. Enss
中科院分区：
文献类型：
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作者：
A. Reifenberger;A. Reiser;S. Kempf;A. Fleischmann;C. Enss
我们开发了一种新的微加工平台，用于测量低热容量镁尺寸金属样品（如超导体）的比热，温度低至10 mK。它解决了此类设置的挑战性问题，例如样品和平台之间的热接触，温度计分辨率以及超过感兴趣样品的附加热容量（通常为20 mK时的nJ/K）。该设置允许我们使用弛豫方法，其中监测明确定义的热脉冲之后的热弛豫以提取比热。样品平台（5 × 5 mm 2）包括一个微结构顺磁Ag：Er温度传感器，该温度传感器通过超导磁通Transformer由直流超导量子干涉器件读出。以这种方式，可以达到30 nK/Hz的相对温度精度，而当T < 300 mK时，附加热容福尔斯下降到远低于0.5 nJ/K。包括镀金安装区域（4.4 × 3 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 mK. It addresses challenging aspects of setups of this kind such as the thermal contact between the sample and platform, the thermometer resolution, and an addenda heat capacity exceeding that of the samples of interest (typically nJ/K at 20 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 × 5 mm2) includes a micro-structured paramagnetic Ag:Er temperature sensor, which is read out by a dc-superconducting quantum interference device via a superconducting flux transformer. In this way, a relative temperature precision of 30 nK/Hz can be reached, while the addenda heat capacity falls well below 0.5 nJ/K for T < 300 mK. A gold-coated mounting area (4.4 × 3 mm2) is included to improve the thermal contact between the sample and platform.