New insight into the thermodynamics of Heisenberg ferromagnets as inferred from high-temperature series - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physica B: Condensed Matter Année : 2017

New insight into the thermodynamics of Heisenberg ferromagnets as inferred from high-temperature series

Résumé

In search of a suitable equation of state for ferromagnets, we revise the information about the Heisenberg model obtainable from high- temperature series. Special attention is paid to the ratio chi(3)/chi(4) (where chi and chi(3) are the linear and cubic susceptibilities) related to Landau's quartic coefficient b. It is found in particular that both chi(3)/chi(4) and b tend to a finite limit as T. TC. This limit is small - an order of magnitude smaller than predicted by Weiss's molecular field and similar theories - but contrary to the common belief, nonzero. This implies a rejection of the generally accepted critical- point exponents and a return to those of Landau: alpha = 0, beta = 1/2, gamma = 1, etc.
Fichier non déposé

Dates et versions

hal-01694489 , version 1 (27-01-2018)

Identifiants

Citer

M. D. Kuz'Min. New insight into the thermodynamics of Heisenberg ferromagnets as inferred from high-temperature series. Physica B: Condensed Matter, 2017, 506, pp.48-54. ⟨10.1016/j.physb.2016.10.041⟩. ⟨hal-01694489⟩
30 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More