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On May 20th 2019, the World Metrology Day, the Bureau International des Poidset Mesures announced a major revision to the four more SI units. The base unit,the kelvin, is defined by fixing the value of Boltzmann constant as indicatedin Mise en pratique for the definition of the kelvin in the SI. To realize thenew kelvin, a novel practical realization technique of single-pressurerefractive-index gas thermometry (SPRIGT) has been jointly developed by theTIPC-CAS in China and the LNE-Cnam in France. To carry out accurate SPRIGT,experimental methods have been implemented and micro-kelvin level temperaturecontrol limits have been predicted and achieved at 5 K to 26 K. The resonatortemperature stability can be maintained to within better than 8 {\mu}K of itsset point with an integration time 33.6 s over 180 h. Besides, solutions forfurther improving the stability were also demonstrated, which can be areference for temperature metrology field worldwide and other fields wherehigh-stability temperature is required. The present work should also provide asolid foundation for international data comparison of thermodynamic temperatureat low temperatures, and will promote realizations of the new kelvin and thespread of high-accuracy, low-temperature metrology.

Prediction and realization of a temperature control limit at low temperatures in SPRIGT