ABSTRACT
During the 1960s interest in possible superfluidity in liquid 3Helium (3He) declined both because of the uncertainty of the theoretical estimates and because experiments designed to find superfluidity were unsucoessful. The main developments in the 1960 concerned the properties of liquid 3He in the normal phase. This chapter deals with theory before experiment. Two ways in which liquid 3He differs from a Fermi gas are important for the discussion of superfluidity. Developments in techniques for attaining low temperatures were crucial for the discovery and investigation of superfluidity in liquid 3He. The first comprehensive reviews of superfluidity in 3He were companion articles by A. J. Leggett on theory and J. C. Wheatley on experiment. The system supporting the paramagnons is the same as the system undergoing the transition to superfluidity, and the contribution made by paramagnon exchange to the total pairing interaction is different above and below the critical temperature.
