Heat-capacity studies of 3He in 3He-4He mixture films and the coverage dependence of the two-dimensional 3He Landau Fermi-liquid parameters -: art. no. 135301

The heat capacity of He-3 in He-3-He-4 mixture films on a nuclepore substrate is reported over the temperature range 90 < T < 124 mK, for He-3 coverages between 0.05 and 1.4 bulk-density atomic layers, and a He-4 film thickness of 4.33 bulk-density atomic layers. A step structure appears in the specific heat as a function of He-3 coverage. Combining NMR and specific heat data for He-3 atoms on the same substrate and for the same He-4 coverage allows the two-dimensional Landau Fermi-liquid parameters F-0(A) of F-1(S) to be extracted as a function of He-3 coverage. We conclude that in the submonalayer He-3 coverage regime p-state pairing is favored.