Narrow Results

We have used the lowest order constrained variational (LOCV) method to calculate some ground-state properties of polarized liquid ³ He at zero temperature with the spin-dependent correlation function employing the Lennard–Jones and Aziz pair potentials. We have seen that the total energy of polarized liquid ³He increases with increasing polarization. For all polarizations, it is shown that the total energy in the spin-dependent case is lower than the spin-independent case. We have seen that the difference between the energies of spin-dependent and spin-independent cases decreases by increasing the polarization. We have shown that the main contribution of the potential energy comes from the spin-triplet state.

By considering a spin dependence for the correlation function, the thermodynamic properties of normal liquid ³He have been investigated by employing a lowest order constrained variational approach. It is seen that the spin-singlet state has a smaller contribution in the potential energy of normal liquid ³He with respect to the spin-triplet state. It is seen that at high temperatures, the free energy of normal liquid ³He in cases of spin-dependent and spin-independent correlation functions are nearly identical. The equations of state of these two cases are nearly similar too.