Abstract
From heat capacity measurements for 3He adsorbed on 4He-preplated mesopore in substrates, FSM-16, HMM-2, and Hectorite, we found fluid states of the 3He adatoms. At very dilute 3He densities, however, it strongly depends on the substrate whether the adatoms are in a localized or a fluid state. The molar heat capacity of a two-dimensional gas or a degenerate Fermi fluid appears above densities nc = 0, 0, and 2 μmol/m2 for FSM-16, HMM-2, and Hectorite, respectively. The critical coverages nc are extremely small or zero for the former two SiO2-based substrates. On the other hand, nc for Hectorite is large. Since Hectorite has strong adsorption sites due to the electric-dipole field gradients around ions located on the substrate surface, these potentials are likely to affect the localization of the dilute 3He adsorbed even on the 4He film.
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