Spin-polarized 3He: liquid gas equilibrium

We study the effects of nuclear polarization M on the liquid-gas equilibrium phase diagram of 3He, in situations where the saturating vapour pressure increases or decreases as a function of M, and where a metamagnetic instability may occur in the liquid phase. Numerical predictions are given within the frame of a phenomenological model with parameters fitted to reproduce accurately the saturating vapour pressure of the unpolarized liquid as well as its magnetic susceptibility. At temperatures of the order of 0.5 K situations are found where interesting phenomena such as liquid overpolarization and metamagnetic plateaus occur