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

Albayrak E.

PHYSICA SCRIPTA, cilt.89, sa.1, 2014 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 89 Sayı: 1
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1088/0031-8949/89/01/015805
  • Dergi Adı: PHYSICA SCRIPTA
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: randomness, spin-3/2, transverse crystal field, tricritical point, EMERY-GRIFFITHS MODEL, BLUME-CAPEL MODEL, MAGNETIC-PROPERTIES, RECURSION METHOD, BILAYER SYSTEM, ISING-MODEL, BEHAVIOR
  • Erciyes Üniversitesi Adresli: Evet

Özet

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.