+/- J Blume-Capel model in the cluster variation method

ALBAYRAK E.

CHINESE JOURNAL OF PHYSICS, vol.54, no.6, pp.978-982, 2016 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 54 Issue: 6
  • Publication Date: 2016
  • Doi Number: 10.1016/j.cjph.2016.11.001
  • Journal Name: CHINESE JOURNAL OF PHYSICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.978-982
  • Keywords: J Model, Cluster variation, Blume-Capel, Ferromagnetic, Phase transition, BETHE
  • Erciyes University Affiliated: Yes

Abstract

The +/- J Blume-Capel model is studied by using the cluster variation method (CVM) in its first approximation which yields results equal to the mean-field ones. The spins are assumed to be interacting either ferromagnetically or antiferromagnetically with the given probabilities p or 1 - p, respectively. The phase diagrams of the model are obtained on the temperature (T)-probability (p) or crystal field (D) planes for given D and p, respectively. The model is examined by introducing the dipolar and quadrupolar order-parameters and, ferromagnetic (F), antiferromagnetic (AF) and paramagnetic (P) phase regions are explored. It is found that the model gives first- and second-order phase transitions and tricritical points. (C) 2016 The Physical Society of the Republic of China (Taiwan). Published by Elsevier B.V. All rights reserved.