SPIN-POLARIZED HE-3-HE-4 LIQUIDS

Dilute liquid He-3-He-4 liquids offer a model system for testing theor ies of weakly interacting fermions. The ability to spin polarize the H e-3 nuclei adds an extra dimension to the field, In this review, the e xtraordinary way in which the polarization of the nuclear spins can mo dify the macroscopic behaviour of the liquid is explained. Frequent re ference to recent experiments and theoretical developments are made an d the various techniques for producing high polarizations are describe d.