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.. (2011) Metallic Coulomb Blockade Thermometry down to 10 mK and below. Journal of physics. Condensed matter, Vol. 23 , 1111.1972.

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Official URL: http://edoc.unibas.ch/dok/A6002541

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Using a recently developed demagnetization refrigerator aimed at microkelvin nanoelectronic experiments, we investigate metallic Coulomb blockade thermometers (CBTs) with various tunnel-junction resistances Rj. The refrigerator cools as low as 0.3 mK while the CBTs saturate at ~10 mK, consistent with weak electron-phonon coupling for the high-Rj sensor and a residual heat leak of 40 aW. More efficient Wiedemann-Franz cooling contributes noticeably for lower-Rj junctions, though these CBTs appear to be more susceptible to environmental heating. Finally, we discuss possible improvements for cooling nanosamples well below 10 mK.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Quantenphysik (Zumbühl)
Item Type:Article
Publisher:Institute of Physics Publishing
Note:Publication type according to Uni Basel Research Database: Journal article
Last Modified:24 May 2013 08:59
Deposited On:11 Oct 2012 15:25

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