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

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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 (C V ) and the magnetic susceptibility (χ) are evaluated from the calculated multiple-exchange hamiltonian. TheC V 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 ofC V is antiferromagnetic, whereas the variations of χ is ferromagnetic.

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Authors and Affiliations

  1. équipe associée au CNRS, Laboratoire de Physique Théorique des liquides, U.P.M.C., Boite 121, 75252, Paris Cedex 05, France

    B. Bernu & C. Lhuillier

  2. National Center for Supercomputer Applications Dept. of Physics, University of Illinois at Urbana-Champaign, 1110 W. Green. St., 61820, Champaign, Il

    D. Ceperley

Authors
  1. B. Bernu
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  2. D. Ceperley
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  3. C. Lhuillier
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Bernu, B., Ceperley, D. & Lhuillier, C. Specific heat and Curie temperature evaluation on triangular lattice: Exchange frequencies for3He adsorbed on grafoil, evaluated by path integral techniques. J Low Temp Phys 89, 589–592 (1992). https://doi.org/10.1007/BF00694094

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