Coulomb Blockade Thermometry on a Wide Temperature Range
O.M. Hahtela, A. Kemppinen, J. Lehtinen, A.J. Manninen, E. Mykk\"anen,, M. Prunnila, N. Yurttag\"ul, F. Blanchet, M. Gramich, B. Karimi, E.T., Mannila, J. Muhojoki, J.T. Peltonen, and J.P. Pekola
TL;DR
This paper discusses extending the operational temperature range of Coulomb Blockade Thermometers from sub-Kelvin to 25 K and demonstrates near-ideal performance with minimal tunnel junctions in a low-impedance environment.
Contribution
It introduces a method to extend the primary thermometry range of CBTs up to 25 K and shows effective operation with only two tunnel junctions.
Findings
Extended CBT operation up to 25 K.
Successful implementation with only two tunnel junctions.
Low-uncertainty temperature measurements from 20 mK to 200 mK.
Abstract
The Coulomb Blockade Thermometer (CBT) is a primary thermometer for cryogenic temperatures, with demonstrated operation from below 1 mK up to 60 K. Its performance as a primary thermometer has been verified at temperatures from 20 mK to 200 mK at uncertainty level below 1 % (k = 2). In a new project, our aim is to extend the metrologically verified temperature range of the primary CBT up to 25 K. We also demonstrate close-to-ideal operation of a CBT with only two tunnel junctions when the device is embedded in a low-impedance environment.
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