Some Thermal Properties of Liquid Helium Three

Abstract

The various anomalies exhibited by the thermal properties of liquid ${\mathrm{He}}^3$ originate with its nuclear spin system according to the statistical thermodynamic formalism elaborated for the latter. This result of general character is verified directly through a quantitative evaluation of the volume expansion coefficient of the saturated liquid. The theory also yields the explanation of the observed pressure dependence of the temperature locus of its volume anomalies near saturation at moderate pressures. The quantitative extension of the theory into the regions of the compressed liquid and the solid will have to await the forth-coming of precise measurements of several thermal properties in these phases of ${\mathrm{He}}^3$.