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)
130 Downloads (Pure)

Abstract

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
Volume83
Issue number8
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

Keywords

  • Coulomb blockade
  • refrigeration
  • refrigerators
  • thermometers

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