An introduced effective-field theory study of spin-1 transverse Ising model with crystal field anisotropy in a longitudinal magnetic field

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YÜKSEL Y., POLAT H.

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, cilt.322, sa.24, ss.3907-3916, 2010 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 322 Sayı: 24
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1016/j.jmmm.2010.08.018
  • Dergi Adı: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.3907-3916
  • Anahtar Kelimeler: Ferromagnetism, IEFT, Order parameters, Spin-1 TIM, PHASE-DIAGRAMS, ORDER PARAMETERS, APPROXIMATION, TRANSITIONS, SYSTEMS
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

A spin-1 transverse Ising model with longitudinal crystal field in a longitudinal magnetic field is examined by introducing an effective field approximation (IEFT) which includes the correlations between different spins that emerge when expanding the identities. The effects of the crystal field as well as the transverse and longitudinal magnetic fields on the thermal and magnetic properties of the spin system are discussed in detail. The order parameters, Helmholtz free energy, entropy and specific heat curves are calculated numerically as functions of the temperature and Hamiltonian parameters. A number of interesting phenomena such as reentrant phenomena originating from the temperature, crystal field, transverse and longitudinal magnetic fields have been found. (C) 2010 Elsevier B.V. All rights reserved.