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

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

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 Néel nomenclature....

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Bibliographic Details
Main Authors: M. Karimou, R.A. Yessoufou, G. Dimitri Ngantso, F. Hontinfinde, E. Albayrak
Format: Article
Language:English
Published: Institute for Condensed Matter Physics 2019-09-01
Series:Condensed Matter Physics
Subjects:
mean-field theory
mixed-spin system
magnetization
compensation temperature
phase transitions
Online Access:https://doi.org/10.5488/CMP.22.33601
Description
Summary: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 Néel 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.
ISSN:1607-324X
2224-9079

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