2011/01/01 by L. Casparis, M. Meschke, D. Maradan +9
Engineering · Physics and Astronomy · Social Sciences · #Atomic and Subatomic Physics Research #Calibration and Measurement Techniques #Coulomb #Coulomb blockade #Dilution refrigerator #Economic and Social Development #Education and Labor Relations #Educational Outcomes and Influences #Humanities #Metal #Noise (video) #Philosophy #Political science #Refrigerator car #Residual #Superconducting and THz Device Technology #cond-mat.mes-hall
paper · pdf · doi:10.1063/1.4744944
published as Rev. Sci. Instr. 83, 083903 (2012) · 3 pages, 3 (color) figures
openalex publication_date 2011/01/01 · arxiv created 2012/06/08 · arxiv updated 2012/08/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/04/28
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] 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.