Phase diagrams and critical behaviours of the mixed spin-5/2 and spin-7/2 Ising system


Karimou M., Yessoufou R. A. , Ngantso G. D. , Hontinfinde F., ALBAYRAK E.

CONDENSED MATTER PHYSICS, cilt.22, 2019 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 22 Konu: 3
  • Basım Tarihi: 2019
  • Doi Numarası: 10.5488/cmp.22.33601
  • Dergi Adı: CONDENSED MATTER PHYSICS

Özet

We used mean-field theory based on the Bogoliubov inequality for the Gibbs free energy to examine the magnetic properties of a mixed spin-5/2 and spin-7/2 Blume-Capel ferrimagnetic system. The thermal behaviours of the system magnetization are classified according to the extended Neel nomenclature. The system exhibits compensation phenomena where a complete cancellation of sublattice magnetizations is observed below the critical temperature. Temperature-dependent phase diagrams are constructed for the case of unequal sublattice crystal field interactions. Under appropriate conditions, our calculations reveal first-order transitions in addition to second-order ones previously observed in Monte Carlo simulations.