Calorimetric Study of the Desorption and Phases of 3He And 4He Adsorbed on Two Layers of H2-plated Graphite Above 0.2K

Author: Ramos Jr. R.C.   Ebey P.S.   Vilches O.E.  

Publisher: Springer Publishing Company

ISSN: 0022-2291

Source: Journal of Low Temperature Physics, Vol.110, Iss.1-2, 1998-01, pp. : 615-620

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Abstract

We have conducted new heat capacity studies of films of 3He and 4He adsorbed on 2.15 layers of hydrogen plating exfoliated graphite for temperatures T > 0.2K and coverages (n) over the entire first layer and beginning of the second layer. Low-density 3He films show two-dimensional Fermi fluid behavior with no liquid-vapor condensation below 0.9K. We have mapped the n-T melting tine and estimated monolayer completion density using heat capacity isotherms. By fitting 3He films' desorption specific heats to a theoretical model, we have calculated the 3He binding energy (21.3K to 21. 7K) and compare it to a previous measurement for 4He films on the same substrate (25.1K to 25.5K).

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