Cluster Variation Method for Frustrated Magnets

  • E. Domínguez Faculty of Physics, University of Havana, 10400 Havana, Cuba
  • A. Lage-Castellanos Faculty of Physics, University of Havana, 10400 Havana, Cuba
  • C. E. Lopetegui
  • R. Mulet Faculty of Physics, University of Havana, 10400 Havana, Cuba

Abstract

The model J1-J2 has provided a good theoretical benchmark for the study of frustrated magnets. This model is studied from the perspective of the Cluster Variation Method (CVM). In a first moment, Bethe approximation is considered. In this context it is possible to obtain a phase diagram where a stripes phase and a paramagnetic phase are observed, though separated by a non-convergence zone. Secondly, plaquette approximation is considered and a complete phase diagram is obtained. In the latter it is observed an additional nematic phase with orientational but not positional order, which was not possible to observe using the Bethe approximation.

Published
Jul 14, 2019
How to Cite
DOMÍNGUEZ, E. et al. Cluster Variation Method for Frustrated Magnets. Revista Cubana de Física, [S.l.], v. 36, n. 1, p. 20-26, july 2019. ISSN 2224-7939. Available at: <http://revistacubanadefisica.org/index.php/rcf/article/view/638>. Date accessed: 22 oct. 2019.
Section
Original Articles