Extended high-temperature series for the Spin-Heisenberg ferromagnet
Résumé
High-temperature series for the magnetic susceptibility and hypersusceptibility of the S = 1 /2 Heisenberg ferromagnet have been extended to 14 th order in x = J/kT for four common lattices. Hence improved estimates have been deduced for the critical points, xc = 0.2491(1) (fcc), 0.3968(2) (bcc), 0.596(1) (sc), 1.124(2) (diamond), as well as for the critical exponents, γ = 1.428(3) and ∆ = 1.814(6). The latter are distinct from the respective values for the classical (S = ∞) Heisenberg model, γ ≈ 1.40 and ∆ ≈ 1.77.
Origine | Fichiers produits par l'(les) auteur(s) |
---|
Loading...