arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1402.5872cond-mat.mes-hallcond-mat.supr-con
收藏

采用大面积超导隧道结的Sub-50 mK电子冷却

Sub-50 mK electronic cooling with large-area superconducting tunnel junctions

H. Q. Nguyen, M. Meschke, H. Courtois, J. P. Pekola

摘要:

在超导隧道结的电子冷却中,冷却功率通过与声子的相互作用和来自过热引线的热流来平衡。我们研究铝基冷却器,配备了一个悬浮正常的金属和一个有效的准颗粒排水。在中等温度下,悬浮的正常金属的声子浴被冷却。在较低的温度下,通过调节结的透明度,我们控制注入电流,从而控制超导体的温度。该装置显示出从150 mK降至约30 mK的强烈冷却,温度为5倍。我们认为,超导体间隙中的空间非均匀性限制了向较低温度冷却。

英文摘要:

In electronic cooling with superconducting tunnel junctions, the cooling power is counterbalanced by the interaction with phonons and by the heat flow from the overheated leads. We study aluminium-based coolers that are equipped with a suspended normal metal and an efficient quasi-particle drain. At intermediate temperatures, the phonon bath of the suspended normal metal is cooled. At lower temperatures, by adjusting the junction transparency, we control the injection current, and thus the superconductor temperature. The device shows a strong cooling from 150 mK down to about 30 mK, a factor of five in temperature. We suggest that spatial non-uniformity in the superconductor gap limits the cooling toward lower temperatures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑