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

19 Citations (Scopus)

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 Sep 6

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Heat capacities of the anomalous fluid phase in two-dimensional <sup>3</sup>He'. Together they form a unique fingerprint.

  • 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