Abstract
We report high-resolution measurements at saturated vapor pressure of the thermal resistivity R of superfluid 4He over the reduced-temperature range 3×10−7<t≡1−T/T λ <3×10−5 (T λ is the transition temperature for Q=0) and heat-current-density range 4<Q<200 μW/cm2. For smaller Q and t, no thermal resistance was detectable below a transition at T c(Q)<T λ. For Q≳10 μW/cm2 we find that the results can be described well by R=(t/t 0)−2.8 K cm/W with t 0=(Q/Q 0)0.904 and Q 0=393 W/cm2. Thus R has an incipient divergence at T λ which is, however, supplanted by T c(Q) where R remains finite. The results imply R∝Q (m−1) with m=3.53±0.02. This differs from the original assumption m=3 of Gorter and Mellink, and from experimental results obtained well below T λ. However, it agrees with measurements by Leiderer and Pobell at larger currents and further below but still close to T λ. Our measurements could not resolve a critical heat current for the onset of resistance.
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Baddar, H., Ahlers, G., Kuehn, K. et al. Thermal Resistance of 4He Below but Very Near the Superfluid Transition. Journal of Low Temperature Physics 119, 1–26 (2000). https://doi.org/10.1023/A:1004683717235
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DOI: https://doi.org/10.1023/A:1004683717235