Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2009-10-30
Journal of Low Temperature Physics 158, 201 (2010)
Physics
Condensed Matter
Other Condensed Matter
6 pages, 4 figures
Scientific paper
10.1007/s10909-009-0013-x
We made heat-capacity measurements of two dimensional (2D) $^3$He adsorbed on graphite preplated with monolayer $^4$He in a wide temperature range (0.1 $\leq T \leq$ 80 mK) at densities higher than that for the 4/7 phase (= 6.8 nm$^{-2}$). In the density range of 6.8 $\leq \rho \leq$ 8.1 nm$^{-2}$, the 4/7 phase is stable against additional $^3$He atoms up to 20% and they are promoted into the third layer. We found evidence that such promoted atoms form a self-bound 2D Fermi liquid with an approximate density of 1 nm$^{-2}$ from the measured density dependence of the $\gamma$-coefficient of heat capacity. We also show evidence for the first-order transition between the commensurate 4/7 phase and the ferromagnetic incommensurate phase in the second layer in the density range of 8.1 $\leq \rho \leq$ 9.5 nm$^{-2}$.
Fukuyama Hiroshi
Matsui Takafumi
Obata Katsunori
Sato Daiki
Takayoshi Shintaro
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