Analysis of the Factors Affecting the Realization of Lambda Transition Temperature of 4He

Metrology and Measurement Systems

J. Zhao¹  P. Lin¹  L. Yin¹  X. Qi¹ 

关键词: 4He;    lambda transition temperature;    sealed-cell;    realization;   

DOI  :  10.2478/v10178-011-0002-7

来源: Versita

【 摘 要 】

Owing to the dramatic change in the thermal conductivity of 4He when its temperature crosses the transition of superfluid (HeI) and normalfluid (HeII), a sealed-cell with a capillary is used to realize the lambda transition temperature, Tλ. A small heat flow is controlled through the capillary of the sealed-cell so as to realize the coexistence of HeI and HeII and maintain the stay of HeI/HeII interface in the capillary. A stable and flat lambda transition temperature "plateau" is obtained. Because there is a depression effect of Tλ caused by the heat flow through the capillary, a series of heat flows and several temperature plateaus are made and an extrapolation is applied to determine Tλ with zero heat flow. A rhodium-iron resistance thermometer with series number A34 (RIRT A34) has been used in 24 Tλ -realization experiments to derive Tλ with a standard deviation of 0.022mK, which proves the stability and reproducibility of Tλ.

【 授权许可】

Unknown