We have measured the heat capacity of He-3 adsorbed on one-dimensional (1D) nanopores of FSM-16 with different pore-diameters. Dilute He-3 atoms on more than one layers of He-4 preplated nanotunnels with 22 angstrom in diameter show a Schottky-type peak around 0.25 K, which is similar to our recent report for 28 angstrom nanotunnels. This behavior of heat capacity is explained as the crossover from 1D to 2D motion of Fermi gas in a confined geometry. The pore-size effect on the temperature and magnitude of the peak is quanlitatively reproduced by a simple calculation for non-interacting Fermi gas in the adsorption potential from the substrate.
Dimensional-Crossover of He-3 Gas Formed in One-Dimensional Nanometer Tunnel
ANCILOTTO, FRANCESCO
2005
Abstract
We have measured the heat capacity of He-3 adsorbed on one-dimensional (1D) nanopores of FSM-16 with different pore-diameters. Dilute He-3 atoms on more than one layers of He-4 preplated nanotunnels with 22 angstrom in diameter show a Schottky-type peak around 0.25 K, which is similar to our recent report for 28 angstrom nanotunnels. This behavior of heat capacity is explained as the crossover from 1D to 2D motion of Fermi gas in a confined geometry. The pore-size effect on the temperature and magnitude of the peak is quanlitatively reproduced by a simple calculation for non-interacting Fermi gas in the adsorption potential from the substrate.
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