Heat capacities of the anomalous fluid phase in two-dimensional 3He

Y. Matsumoto, D. Tsuji, S. Murakawa, H. Akisato, H. Kambara, Hiroshi Fukuyama

Research output: Contribution to journalArticle

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Abstract

We measured heat capacities of two dimensional 3He adsorbed on graphite preplated with a 4He monolayer (3He/ 4He/gr) in a wide temperature (0.3 ≤ T ≤ 80 mK) and density range (1.3 ≤ ρ ≤ 7.3 nm-2). We found that the system behaves as a normal Fermi fluid at low densities between 1.3 and 5.6 nm-2 where the quasiparticle effective mass seems to diverge at a density for the 4/7 phase (ρ4/7 = 6.8 nm-2). At higher densities but below ρ4/7, we observed anomalous temperature dependencies of heat capacity with two round maxima near 1 and 30 mk. With increasing density in this region, a high temperature weight of heat capacity decreases selectively leaving the 30 mK peak, while the 1 mK peak develops. This unexpected behavior can not be explained by the conventional two-phase co-existence model. Instead, we propose here that the 2D normal Fermi fluid is continuously transformed to the 4/7 Mott localized phase through a new quantum phase where a hopping of the zero-point vacancy plays an important role.

Original languageEnglish
Pages (from-to)271-276
Number of pages6
JournalJournal of Low Temperature Physics
Volume138
Issue number1-2
DOIs
Publication statusPublished - 2005

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Specific heat
specific heat
Fluids
fluids
Graphite
Temperature
Vacancies
Monolayers
graphite
temperature

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Matsumoto, Y., Tsuji, D., Murakawa, S., Akisato, H., Kambara, H., & Fukuyama, H. (2005). Heat capacities of the anomalous fluid phase in two-dimensional 3He. Journal of Low Temperature Physics, 138(1-2), 271-276. https://doi.org/10.1007/s10909-005-1562-2

Heat capacities of the anomalous fluid phase in two-dimensional 3He. / Matsumoto, Y.; Tsuji, D.; Murakawa, S.; Akisato, H.; Kambara, H.; Fukuyama, Hiroshi.

In: Journal of Low Temperature Physics, Vol. 138, No. 1-2, 2005, p. 271-276.

Research output: Contribution to journalArticle

Matsumoto, Y, Tsuji, D, Murakawa, S, Akisato, H, Kambara, H & Fukuyama, H 2005, 'Heat capacities of the anomalous fluid phase in two-dimensional 3He', Journal of Low Temperature Physics, vol. 138, no. 1-2, pp. 271-276. https://doi.org/10.1007/s10909-005-1562-2
Matsumoto Y, Tsuji D, Murakawa S, Akisato H, Kambara H, Fukuyama H. Heat capacities of the anomalous fluid phase in two-dimensional 3He. Journal of Low Temperature Physics. 2005;138(1-2):271-276. https://doi.org/10.1007/s10909-005-1562-2
Matsumoto, Y. ; Tsuji, D. ; Murakawa, S. ; Akisato, H. ; Kambara, H. ; Fukuyama, Hiroshi. / Heat capacities of the anomalous fluid phase in two-dimensional 3He. In: Journal of Low Temperature Physics. 2005 ; Vol. 138, No. 1-2. pp. 271-276.
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