Abstract
We have studied the heat capacities of heliums adsorbed in Na-Y zeolite down to 70 mK. The Y-type zeolite has void cages 1.3 nm in diameter connected through narrow apertures 0.8 nm in diameter. In the nanopores at low temperatures, the second-layer He adatoms can be confined in each cage by the first solid layer. In the quantum fluid region above the second-layer promotion, where the heat capacities show qualitative differences between 4He and 3He, the heat capacities of 3He adatoms and the thermal relaxation processes show large and non-monotonic changes when one 3He atom is added in each cage. These results strongly suggest that the quantum fluid formed in Na-Y zeolite is not fluid film spread over the entire substrate but quantum clusters confined in each cage.
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Matsushita, T., Toda, R., Hieda, M. et al. Quantum States of Helium Atoms Confined in Nanocage in Na-Y Zeolite. J Low Temp Phys 158, 188–193 (2010). https://doi.org/10.1007/s10909-009-0006-9
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DOI: https://doi.org/10.1007/s10909-009-0006-9