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.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Materials Science(all)
- Condensed Matter Physics