Metallic Coulomb Blockade Thermometry down to 10 mK and below

Details Metallic Coulomb Blockade Thermometry down to 10 mK and below Metallic Coulomb Blockade Thermometry down to 10 mK and below

2011-11-08

arxiv.org/abs/1111.1972v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages, 3 (color) figures

Scientific paper

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.

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