Abstract
Heat capacities of 3 He and 4 He adsorbed on Na-Y zeolite, which has regular interconnected channels of diameters only about 10 A, have been measured in the temperature range 0.1–2 K as a function of the adsorbed helium amount n . The results suggest that the helium atoms are bound to Na + cations and to the substrate in the region of n below n ∼8.5 atoms/cage (40% of full channel). The heat capacity of 3 He for n around 12 atoms/cage shows the same characters as 3 He Fermi liquids. It is likely that, in this region of n , the Fermi degeneracy occurs below the lowest temperature of the present study.
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