ANOMALIES IN THE HEAT-CAPACITY OF 2D-FLUID AND SOLID HE-3 AT LOW MK TEMPERATURES - (15TH FRITZ-LONDON-MEMORIAL-AWARD-LECTURE)

He-3 adsorbed on graphite provides a unique system for studying the ve ry low temperature properties of two-dimensional Fermi liquids and com mensurate and incommensurate solids. Here, heat capacity results are p resented which suggest that the first layer fluid formed at low areal densities, and also the second layer fluid formed on top of a compress ed solid He-3 first layer, may undergo superfluid transitions at 3.2 m K. At higher densities the second layer fluid freezes into a solid reg istered relative to the first layer. This solid phase exhibits a large nuclear spin contribution to the heat capacity with a peak at 2.5 mK. Some of the unusual properties of this solid will be discussed.