期刊
REVIEW OF SCIENTIFIC INSTRUMENTS
卷 83, 期 8, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4744944
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资金
- Swiss Nanoscience Institute (SNI)
- NCCR QSIT
- Swiss NSF
- ERC starting grant
- EU-FP7 SOLID
- MICROKELVIN
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]
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