On the thermodynamic status of The Provisional Low Temperature Scale from 0.9 mK to 1 K , PLTS-2000, evaluated by primary thermometry

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Abstract
In this paper we present a new evaluation of the thermodynamic status of The Provisional Low Temperature Scale from 0.9 mK to 1 K (PLTS-2000) based on comparison measurements with different primary thermometers. The evaluation includes new experimental data for the ultra-low temperature range down to 0.9 mK as well as data already published for the higher temperature range up to 0.7 K. In our data the PLTS-2000 agrees with thermodynamic temperature better than 0.33% from 1 K down to about 3 mK. Below 3 mK, PLTS-2000 is systematically higher than thermodynamic temperature with a deviation of 1% at 1.72 mK, which grows up to about 3.84% at 0.902 mK. A polynomial fit is given for the deviation of PLTS-2000 from thermodynamic temperature for the whole temperature range of the PLTS-2000. All data on which the current evaluation is based are provided in appendices. As the PLTS-2000 is thermodynamically correct better than 1% over almost its whole definition range, it is justified to consider the PLTS-2000 as a validated temperature scale and remove its provisional status.
Funding Information
  • EURAMET EMRP and European Community’s Seventh Framework Programme (SIB01, Grant Agreement No. 217257)
  • EURAMET EMPIR and European Union’s Horizon 2020 (15SIB02 InK 2)
  • EURAMET EMPIR and European Union’s Horizon 2020 (18SIB02 Real-K)

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