Random crystal field effects for spin-3/2 Blume-Capel model

Albayrak E.

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, vol.323, no.22, pp.2846-2850, 2011 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 323 Issue: 22
  • Publication Date: 2011
  • Doi Number: 10.1016/j.jmmm.2011.06.033
  • Journal Name: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2846-2850
  • Keywords: Random crystal field, Bethe lattice, Spin-3/2
  • Erciyes University Affiliated: Yes

Abstract

The effects of crystal field (Delta) which is randomly turned on with probability p or turned off with probability 1-p on the sites of the Bethe lattice are investigated to study the critical behavior of the spin-3/2 Blume-Capel model. The order-parameters are obtained in terms of the recursion relations and then the possible phase diagrams are calculated at finite temperatures for given system parameters p, Delta and coordination numbers z=3, 4, 5 and 6. It was found that the phase diagrams change drastically for given probability and randomness. The first-order phase transitions are only found for higher p values and the lines of which get shorter and eventually disappearas p decreases. The critical lines do not present any qualitative differences with z, but they are seen at higher temperatures for higher z. (C) 2011 Elsevier B.V. All rights reserved.