The effective-field theory studies of critical phenomena in a mixed spin-1 and spin-2 Ising model on honeycomb and square lattices

DEVİREN B., ERTAŞ M., KESKİN M.

PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, cilt.389, sa.10, ss.2036-2047, 2010 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 389 Sayı: 10
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1016/j.physa.2010.01.038
  • Dergi Adı: PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.2036-2047
  • Anahtar Kelimeler: Mixed spin-1 and spin-2 Ising model, Effective-field theory, Magnetization, Phase diagram, HEISENBERG FERRIMAGNETIC SYSTEM, MAGNETIC-PROPERTIES, MONTE-CARLO, CRITICAL-BEHAVIOR, COMPENSATION TEMPERATURES, PHASE-TRANSITIONS, HYSTERESIS LOOPS, INTERNAL ENERGY, BILAYER SYSTEM, ORDER
  • Erciyes Üniversitesi Adresli: Evet

Özet

An effective-field theory with correlations has been used to study critical behaviors of a mixed spin-1 and spin-2 Ising system on a honeycomb and square lattices in the absence and presence of a longitudinal magnetic field The ground-state phase diagram of the model is obtained in the longitudinal magnetic field (It) and a single-ion potential or crystal-field interaction (Delta) plane The thermal behavior of the sublattice magnetizations of the system are investigated to characterize the nature of (continuous and discontinuous) of the phase transitions and obtain the phase transition temperature The phase diagrams are presented in the (Delta/vertical bar J vertical bar, k(B)T/vertical bar J vertical bar) plane The susceptibility, internal energy and specific heat of the system are numerically examined and some interesting phenomena in these quantities are found due to the absence and presence of the applied longitudinal magnetic field. Moreover, the system undergoes second- and first-order phase transition; hence, the system gives a tricritical point The system also exhibits reentrant behavior (C) 2010 Elsevier B.V. All rights reserved