Evidence for a Self-Bound Liquid State and the Commensurate-Incommensurate Coexistence in 2D $^3$He on Graphite
| Autor: | Sato, D., Tsuji, D., Takayoshi, S., Obata, K., Matsui, T., Fukuyama, Hiroshi |
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| Rok vydání: | 2009 |
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| Zdroj: | Journal of Low Temperature Physics 158, 201 (2010) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1007/s10909-009-0013-x |
| Popis: | 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$^{-2}$. Comment: 6 pages, 4 figures |
| Databáze: | arXiv |
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