High-Precision Specific-Heat Measurements on Normal LiquidHe3

Abstract

High-precision measurements have been made of the specific heat of pure liquid ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ for $8<T<\mathrm{}500\mathrm{}$ mK and for $0<P<\mathrm{}32.5\mathrm{}$ bars. Such measurements have importance because of their strong bearing on our basic understanding of both normal and superfluid ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ and because they provide a valuable input towards determining an absolute temperature scale at low temperatures. The specific-heat results for $T\lesssim 100$ mK differ significantly from all of the previous measurements on ${}_{}{}^3{}_{}{}^{}\mathrm{He}$. Only the new data, however, satisfy several important thermodynamic checks.