Specific heat and Curie temperature evaluation on triangular lattice: Exchange frequencies for3He adsorbed on grafoil, evaluated by path integral techniques

B. Bernu, D. Ceperley, C. Lhuillier

Research output: Contribution to journalArticlepeer-review

Abstract

We compute, using path integrals, the cyclic-exchange frequencies of a monolayer of 3 He adsorbed on graphite in the incommensurate solid phase. Interactions between helium atoms are treated with the Aziz potential; between an helium atom and the plan of graphite we use an interaction potential which depends only on the distance above the surface. The specific heat (CV) and the magnetic susceptibility (χ) are evaluated from the calculated multiple-exchange hamiltonian. The CV value converges with the 2-, 3- and 4-body exchange cycles while larger cycles are needed for the convergence of the χ value. For the density 0.0785 atom/Å2, we find that the variations of CV is antiferromagnetic, whereas the variations of χ is ferromagnetic.

Original languageEnglish (US)
Pages (from-to)589-592
Number of pages4
JournalJournal of Low Temperature Physics
Volume89
Issue number3-4
DOIs
StatePublished - Nov 1992

ASJC Scopus subject areas

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

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