Metallic Coulomb blockade thermometry down to 10 mK and below
Metallic Coulomb blockade thermometry down to 10 mK and below
复制标题
DOI：
10.1063/1.4744944
复制
发表时间：
2012-08-01
影响因子：
1.6
通讯作者：
Zumbuehl, D. M.
中科院分区：
文献类型：
--
作者：
Casparis, L.;Meschke, M.;Zumbuehl, D. M.
提出了一种改进的核制冷机，达到0.3 mK，针对微开尔文纳米电子实验，并使用它来研究金属库仑阻塞温度计（CBTs）与不同的电阻R。高R器件冷却到略低的T，与噪声环境的更好隔离一致，并表现出与T-5成比例的电子-声子冷却和40 aW的余热泄漏。与此相反，低R CBTs显示冷却与明显较弱的T-依赖性，偏离电子-声子机制。CBTs与20 mK以上的冰箱温度非常一致，并达到7.5 +/- 0.2 mK的最小T。(C)2012年美国物理学会。[http：//dx.doi.org/10.1063/1.4744944]
We present an improved nuclear refrigerator reaching 0.3 mK, aimed at microkelvin nanoelectronic experiments, and use it to investigate metallic Coulomb blockade thermometers (CBTs) with various resistances R. The high-R devices cool to slightly lower T, consistent with better isolation from the noise environment, and exhibit electron-phonon cooling proportional to T-5 and a residual heat-leak of 40 aW. In contrast, the low-R CBTs display cooling with a clearly weaker T-dependence, deviating from the electron-phonon mechanism. The CBTs agree excellently with the refrigerator temperature above 20 mK and reach a minimum-T of 7.5 +/- 0.2 mK. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4744944]