Abstract
We have measured heat capacities of monolayer 3 He floated on a superfluid 4 He thin film (three atomic layers) adsorbed on graphite at low temperatures. The 3 He films behave as degenerate 2D Fermi fluids with m* ≈ 1.3m 3, where m* is the quasiparticle effective mass and m 3 is the bare mass of 3 He, in the whole temperature range we studied (1 ≤ T ≤ 80 mK). No anomalous behavior suggesting “puddling” nor other phase transitions is observed. In contrast to our previous measurements for pure 3 He films without the underlying 4 He film, the temperature independent heat-capacity contribution is not observed. This can be explained by the second-layer localized spins trapped on substrate heterogeneities being replaced by nonmagnetic 4 He.
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Morishita, M., Nagatani, H. & Fukuyama, H. Heat Capacities of Monolayer 3He Fluids Floated on A Superfluid 4He Thin Film. Journal of Low Temperature Physics 113, 299–304 (1998). https://doi.org/10.1023/A:1022550717249
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DOI: https://doi.org/10.1023/A:1022550717249