Phase diagrams in mixed spin-3/2 and spin-2 Ising system with two alternative layers within the effective-field theory

doi:10.1088/1674-1056/20/6/060507

Abstract The phase diagrams in the mixed spin-3/2 and spin-2 Ising system with two alternative layers on a honeycomb lattice are investigated and discussed by the use of the effective-field theory with correlations. The interaction of the nearest-neighbour spins of each layer is taken to be positive (ferromagnetic interaction) and the interaction of the adjacent spins of the nearest-neighbour layers is considered to be either positive or negative (ferromagnetic or antiferromagnetic interaction). The temperature dependence of the layer magnetizations of the system is examined to characterize the nature (continuous or discontinuous) of the phase transitions and obtain the phase transition temperatures. The system exhibits both second- and first-order phase transitions besides triple point (TP), critical end point (E), multicritical point (A), isolated critical point (C) and reentrant behaviour depending on the interaction parameters. We have also studied the temperature dependence of the total magnetization to find the compensation points, as well as to determine the type of behaviour, and N-type behaviour in Néel classification nomenclature existing in the system. The phase diagrams are constructed in eight different planes and it is found that the system also presents the compensation phenomena depending on the sign of the bilinear exchange interactions.

Keywords: mixed spin-3/2 and spin-2 Ising system effective-field theory compensation phenomena phase diagrams

Received: 12 November 2010
Revised: 17 January 2011
Accepted manuscript online:

PACS:	05.50.+q	(Lattice theory and statistics)
	05.70.Fh	(Phase transitions: general studies)
	64.60.De	(Statistical mechanics of model systems (Ising model, Potts model, field-theory models, Monte Carlo techniques, etc.))
	75.10.Hk	(Classical spin models)

Fund: Project supported by the Scientiˉc and Technological Research Council of Turkey (TüB_ITAK) (Grant No. 107T533) and Erciyes University Research Funds (Grant No. FBD-08-593).

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Bayram Deviren, Yasin Polat, and Mustafa Keskin Phase diagrams in mixed spin-3/2 and spin-2 Ising system with two alternative layers within the effective-field theory 2011 Chin. Phys. B 20 060507

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Phase diagrams in mixed spin-3/2 and spin-2 Ising system with two alternative layers within the effective-field theory

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