Low Temperature Heat-Capacities of Liquid 3He Thin Films

Author： Morishita M.   Ishida K.   Yawata K.   Nagatani H.   Fukuyama H.  

Publisher： Springer Publishing Company

ISSN： 0022-2291

Source： Journal of Low Temperature Physics, Vol.110, Iss.1-2, 1998-01, pp. : 351-356

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Abstract

We have measured the heat capacity of 3He thin films adsorbed on graphite at an areal density of 15.0 nm-2 down to as low as 100 μK. The second-layer 3He behaves as a degenerate 2D Fermi fluid in the whole temperature range we studied. We observed no anomalous behavior in the heat capacity near 3 mK in contradiction to the recent report by other workers. This indicates that possible superfluid transitions would be below 100 μK. Instead, a small and temperature-independent contribution to the heat capacity was observed, which we attribute to nuclear-spin degrees of freedom in glassy solid 3He trapped in substrate heterogeneities.

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