Binary alloy in random field: Phase diagrams

Karakoyun, Gülşen; Akıncı, Ümit

doi:10.1016/j.physa.2018.07.003

Cited by 6 publications

(4 citation statements)

References 32 publications

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“…While the crystal field parameter takes large negative values, critical temperature values converge at one point, and concentration is no longer important for certain temperature values. We can say that, the behaviors of the critical temperatures obtained in this case are compatible with the mixed [22,26] and binary alloy systems [50][51][52].…”

Section: Half Integer -Half Integer Spin Modelsupporting

confidence: 73%

“…Perturbation theory was also used for extended spin S model [45]. On the other hand, the system consisting of different spin values such as spin-1/2-1 has been examined by several methods such as EFT for amophous ferrimagnetic [46][47][48] and ferromagnetic [49][50][51][52] binary alloys; MFT [53][54][55] and MC [56] methods. Spin-1/2-3/2 model has been inspected by use of MFT [54,57] and also within EFT [58,59].…”

Section: Introductionmentioning

confidence: 99%

“…[50][51][52].If we choose spin values of the system as S A = 3/2, S B = 2 (Fig 5 (b)), the critical temperature increases for larger values of crystal field, whereas it decreases for negative large crystal field parameters. When all of the lattice sites consist of type-B atoms it displays a larger TCP value (compare Fig 5 (a) and (b)).…”

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confidence: 99%

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Phase Diagrams of Generalized Spin-S Magnetic Binary Alloys

Karakoyun,

Akıncı

2020

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Critical properties of the generalized spin-S magnetic binary alloys represented by A c B 1−c have been investigated within the framework of EFT. By inspecting the evolution of the phase diagrams with the concentration for several spin values, general results have been obtained. Obtained results cover the results obtained for special cases in the literature. Type of the transition (first/second order), as well as the presence of the tricritical point have been determined for general spin models. It has also been shown that, the same critical concentration value exist in the system, regardless of the spin value for binary alloy consist of half integer-integer spin alloy.

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Section: Half Integer -Half Integer Spin Modelsupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

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Phase Diagrams of Generalized Spin-S Magnetic Binary Alloys

Karakoyun,

Akıncı

2020

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“…Disordered binary alloys represented by A c B 1−c can be modeled theoretically using well-known Ising-like models. Binary alloy systems consisting of different spin values, such as half integerinteger spin valued models are investigated by means of the effective field theory (EFT) [4][5][6], mean field theory (MFT) [7][8][9] and Monte Carlo (MC) simulations [10]. Models with half integer -half integer spins are also examined by means of MFT [11] and also within the two frameworks EFT and MFT [12,13].…”

Section: Introductionmentioning

confidence: 99%

Hysteresis Characteristics of Generalized Spin-S Magnetic Binary Alloys

Karakoyun¹,

Akıncı²

2020

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In this study, hysteresis characteristics of the generalized spin-S binary alloy represented by the formula A c B 1−c have been investigated within the framework of effective field approximation. The binary system consists of type A (spin-S) and type B (spin-S) atoms which are randomly distributed on a honeycomb lattice. Both integer and half-integer spin models of two magnetic atom types are examined. By detailed investigation on hysteresis loops, multiple hysteresis behaviors are obtained for a given set of Hamiltonian parameters. Besides, the quantities of hysteresis characteristics as the hysteresis loop area, remanent magnetization, and coercive field have been investigated as functions of concentration.

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