Phase equilibrium in a polarized saturated He-3-He-4 mixture

We present experimental results on the phase equilibrium of a saturated He-3-He-4 mixture, which has been cooled to a temperature of 10-15 mK and polarized in a He-4 circulating dilution refrigerator to a stationary polarization of 15%, 7 times higher than the equilibrium polarization in the external field of 7 T. The pressure dependence of the polarization enhancement in the refrigerator shows that the molar susceptibilities of the concentrated and dilute phase of a saturated He-3-He-4 mixture are equal at p = 2.60 +/- 0.04 bar. This result affects the Fermi liquid parameters of the dilute phase. The osmotic pressure in the dilute phase has been measured as a function of the polarization of the coexisting concentrated phase up to 15%. We find that the osmotic pressure at low polarization (<7%) agrees well with thermodynamics using the new Fermi liquid parameters of the dilute phase.