Abstract
The heat capacity, C Q , of superfluid 4He in the presence of a constant heat flux, Q, is expected to diverge at a depressed transition temperature, T c( Q). We have taken preliminary measurements of C Q at various heat flux values in the range 1 μW/ cm 2⩽Q⩽4 μW/ cm 2 . We observe that at sufficiently small reduced temperatures, C Q is enhanced as a function of Q, and that the enhancement is larger than theoretical predictions by Chui et al. and Hausmann and Dohm (Phys. Rev. Lett 77 (1996) 980, 1793; preprint).
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