Metallic Coulomb Blockade Thermometry down to 10 mK and below

Casparis, L. and Meschke, M. and Maradan, D. and Clark, A. C. and Scheller, C. and Schwarzwälder, K. K. and Pekola, J. P. and Zumbühl, D. M.. (2012) Metallic Coulomb Blockade Thermometry down to 10 mK and below. Review of scientific instruments, Vol. 83 , 083903.

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Official URL: http://edoc.unibas.ch/dok/A6070655

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We present an improved nuclear refrigerator reaching 0.3 mK, aimed at microkelvin nanoelectronicexperiments, and use it to investigate metallic Coulomb blockade thermometers (CBTs) with variousresistances R. The high-R devices cool to slightly lower T, consistent with better isolationfrom the noise environment, and exhibit electron-phonon cooling ∝T^5 and a residual heat-leak of40 aW. In contrast, the low-R CBTs display cooling with a clearly weaker T-dependence, deviatingfrom the electron-phonon mechanism. The CBTs agree excellently with the refrigerator temperatureabove 20 mK and reach a minimum-T of 7.5 ± 0.2 mK.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Quantenphysik (Zumbühl)
UniBasel Contributors:Zumbühl, Dominik M
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Institute of Physics
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:24 May 2013 09:21
Deposited On:24 May 2013 08:59

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