Abstract
Quantum fluids of4He and3He adsorbed on mesopores of Hectorite were studied by measuring the heat capacity down to 50mK. Phonon and roton-like heat capacities of the two-dimensional (2D) superfluid were observed as a function of the coverage. Comparisons with model calculations suggest a strong correlation between the4He adatoms of which an effective hard core diameter is 4–6A. At the coverage and temperatures corresponding to the superfluid, the3He adatoms show a large nuclear heat capacity probably due to a Fermi degeneracy. The temperature-linear region in the3He heat capacity is likely to be much lower than that expected for an ideal Fermi gas. Assuming a 2D Fermi liquid, the effective mass at the coverage of about 2 layers is estimated to be 2.5 times that of the3He atom.
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