STRONGLY CORRELATED 2-DIMENSIONAL FLUID HE-3

A two dimensional system of strongly correlated fermions can be realis ed by a fluid monolayer of He-3 adsorbed on an atomically flat surface . We report extensive measurements of the heat capacity, c, of He-3 ad sorbed an graphite plated with two layers of hydrogen deuteride (HD) o ver a closely spaced grid of coverages in the temperature range 1-80mK . The quasiparticle effective mass ratio, inferred from the linear tem perature coefficient of the heat capacity, increases from near unity a t low densities and appears to diverge approaching localisation. The m aximum value of m/m toe are able to unambiguously extract from the da ta is 13 at a density 5 nm(-2). At this density c/T is temperature ind ependent only below 5mK. The behaviour of m/m and F-0(a), inferred fr om magnetization data, are consistent with the model of almost-localis ed fermions. We can trade the evolution of strong finite temperature d eviations from Fermi liquid behaviour as the density of the film and h ence m/m are increased. At sufficiently low temperature this correcti on is of T-2 form going over to a large TlnT deviation for T > 0.05 T- F, as predicted for 2D spin fluctuations. Thus in this system 'non-Fe rmi liquid' behaviour extends to very low temperatures in the strongly correlated, large m/m, limit.