Metallic Coulomb blockade thermometry down to 10 mK and below

L. Casparis, M. Meschke, D. Maradan, A.C. Clark, C.P. Scheller, K.K. Schwarzwälder, J.P. Pekola, D.M. Zumbühl

Research output: Contribution to journalArticleScientificpeer-review

21 Citations (Scopus)
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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 ∝ 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.
Original languageEnglish
Article number083903
Pages (from-to)1-3
Number of pages3
JournalReview of Scientific Instruments
Issue number8
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed


  • Coulomb blockade
  • refrigeration
  • refrigerators
  • thermometers


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