Renormalization of the 4He λ-Transition in 3He–4He Mixtures
The specific heat at constant pressure at the λ-transition of pure 4He is very nearly logarithmically divergent.1 In the presence of a constant 3He concentration this specific heat is renormalized in such a way that it tends to reach a finite value with an infinite slope.2,3 The effect of an impurity on the critical point behavior of a pure substance has been discussed by Fisher4 and Fisher and Scesney.5 It is pointed out by Fisher that along with the renormalization of C px , the specific heat at constant pressure, and 3He concentration, one expects that C pø , where ø = μ 3 − μ 4, the difference in the molar chemical potential of the two isotopes, will behave as C p for pure 4He. We have analyzed our data to obtain a more quantitative description for the behavior of C px and C pø .
KeywordsHeat Capacity Measured Heat Capacity Tricritical Point Pure System Infinite Slope
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