论文标题
使用接近效果控制虹膜膜的$ t_c $
Controlling $T_c$ of Iridium Films Using the Proximity Effect
论文作者
论文摘要
对于高分辨率的量热检测，具有低$ T_C $的超导过渡传感器（TES）至关重要。为了开发敏感的量热量计，用于在低温中微子双β衰减搜索中应用应用，我们一直在研究将IR膜的$ T_C $降低到20 mk的方法。利用超导体和普通金属之间的接近效应，我们发现了两种室温制造食谱，用于制作基于IR的低$ T_C $膜。在第一种方法中，根据相对厚度，在20-100 mk的范围内将两部Au/ir/au Trilayer的IR胶片夹在两个AU胶片之间，其$ T_C $在20-100 mk的范围内。在第二种方法中，使用顺磁性PT薄膜用于在同一范围内使用可调$ T_C $创建IR/PT BiLayer。我们介绍了基于IR的低$ T_C $膜的制造和表征的详细研究，并将实验结果与理论模型进行了比较。我们表明，具有可预测且可再现的临界温度的基于IR的膜可以一致地用于大规模检测器应用中。
A superconducting Transition-Edge Sensor (TES) with low-$T_c$ is essential in a high resolution calorimetric detection. With a motivation of developing sensitive calorimeters for applications in cryogenic neutrinoless double beta decay searches, we have been investigating methods to reduce the $T_c$ of an Ir film down to 20 mK. Utilizing the proximity effect between a superconductor and a normal metal, we found two room temperature fabrication recipes of making Ir-based low-$T_c$ films. In the first approach, an Ir film sandwiched between two Au films, a Au/Ir/Au trilayer, has a tunable $T_c$ in the range of 20-100 mK depending on the relative thicknesses. In the second approach, a paramagnetic Pt thin film is used to create Ir/Pt bilayer with a tunable $T_c$ in the same range. We present detailed study of fabrication and characterization of Ir-based low-$T_c$ films, and compare the experimental results to theoretical models. We show that Ir-based films with predictable and reproducible critical temperature can be consistently fabricated for use in large scale detector applications.
