Abstract
We present resugts of an extensive investigation with heat capacity measurements of the first layer phases of 3He-4He mixtures adsorbed on graphite preplated with two layers of H2, for a wide range of coverages, and for temperatures between 0.2 K and 2.0 K. We observe the evolution of the twodimensional liquid(L)-vapor(V) coexistence region as a function of the 3He molar fraction(x). The L-V critical points, starting with 0.9 K at x=0, move to lower temperatures and the density of the self-bound liquid decreases as x increases, pointing towards a limiting value of x for L-V coexistence, in agreement with theoretical expectations. At densities higher than those producing L-V coexistence, we observe the onset of transitions to a phase present in the mixtures but apparently absent in the pure isotopic cases. Possible interpretations of the data will be discussed.
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