Phase diagrams of the spin-3/2 random transverse crystal field model

Albayrak E.

PHYSICA SCRIPTA, vol.89, no.1, 2014 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 89 Issue: 1
  • Publication Date: 2014
  • Doi Number: 10.1088/0031-8949/89/01/015805
  • Journal Name: PHYSICA SCRIPTA
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: randomness, spin-3/2, transverse crystal field, tricritical point
  • Erciyes University Affiliated: Yes

Abstract

The mean-field approximation is used to calculate the phase diagrams of the spin-3/2 random transverse crystal field (RTCF) model. A bimodal distribution of the RTCF is employed in which one of the modes is in competition with the other mode whose strength is adjusted with a controllable parameter alpha. Thus, some sites in the lattice are under the effect of RTCF D-x with probability p and the rest of the sites are under the effect of alpha D-x with 1 - p. The phase diagrams of the model are obtained on the RTCF-temperature planes by varying p on square lattices. Both second-and first-order phase transitions are displayed and thus tricritical points are also observed. The critical end points and end points for the first-order phase transition lines were also found.