Effects of 4He substitution on low temperature heat capacities of 2D 3He adsorbed on graphite

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

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Abstract

We measured heat capacities of the second layer 3He admixed with a small amount of 4He (= 0.9 nm-2) on graphite preplated with a monolayer 4He. The aim of this study is to elucidate possible 4He substitution effects on a recently proposed new quantum phase existing at densities just below that (ρ4/7) for the 4/7 registered phase. This phase is supposed to be the hole (zero-point vacancy) doped Mott localized phase. The substitution gives rise to an excess heat capacity (Cex) with unusual temperature and density dependencies which is most pronounced at a slightly lower density than ρ4/7. The Cex stays relatively large even at ρ4/7, and suddenly disappears at a slightly higher density. One possible scenario, which is consistent with the present data, is that the Cex comes from the isotopic mixing effect existing in a narrow density range around ρ4/7 and that there exists an excess particle phase just above ρ4/7 in addition to the hole doped phase below. The result may suggest finite fluidity or unexpectedly large band widths for the isotopic impurities in the 4/7 phase.

Original languageEnglish
Pages (from-to)277-282
Number of pages6
JournalJournal of Low Temperature Physics
Volume138
Issue number1-2
DOIs
Publication statusPublished - 2005 Sep 6

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ASJC Scopus subject areas

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

Cite this

Tsuji, D., Matsumoto, Y., Murakawa, S., Akisato, H., Kambara, H., & Fukuyama, H. (2005). Effects of 4He substitution on low temperature heat capacities of 2D 3He adsorbed on graphite. Journal of Low Temperature Physics, 138(1-2), 277-282. https://doi.org/10.1007/s10909-005-1563-1