Phase transition in ising magnetic superlattice nanowires: Molecular field theory approach

Tanriverdiyev, V. A.

doi:10.1016/j.jmmm.2015.05.015

Cited by 10 publications

(2 citation statements)

References 21 publications

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“…From the theoretical point of view, several techniques have been used, such as mean-field approximation (MFA) [8,18], effective field theory (EFT) [7,13,14], Monte Carlo simulation (MC) [18][19][20], among others [21,22]. Special attention has been given to the study of mixed spin systems, in particular those composed by spin-1 and spin-1/2 particles arranged in hexagonal structures [7,8,14,15,18].…”

Section: Introductionmentioning

confidence: 99%

Anomalous thermodynamics in a mixed spin-1/2 and spin-1 hexagonal nanowire system

Pimenta,

Rojas,

de Souza

2021

Preprint

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The mixed spin-1/2 Ising model and spin-1 Blume-Capel model in an hexagonal nanowire structure under the presence of crystal field is considered. The free energy is obtained through the transfer matrix technique, which is solved numerically. Our main result lies in the presence of pseudo-transition in low temperature region near the ferrimagnetic/ferromagnetic boundary, due to the influence of a crystal field. The evidence of a pseudo-transition is observed in several quantities. Free energy first derivative quantities like entropy and internal energy show an abrupt but continuous jump, whereas quantities associated with second derivatives of the free energy like the specific heat exhibit a strong sharp peak, quite similar to a second order phase transition. We also investigate magnetization patterns and do not find evidence of spontaneous magnetization. Nevertheless, assuming a small magnetic field, we can induce a magnetization which resembles a spontaneous magnetization at a pseudo-critical temperature.

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Section: Introductionmentioning

confidence: 99%

Anomalous thermodynamics in a mixed spin-1/2 and spin-1 hexagonal nanowire system

Pimenta,

Rojas,

de Souza

2021

Preprint

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“…Современные теорфизические методы, такие как гриновские функции (ФГ), теория среднего поля, метод эффективного поля, с учетом корреляций (МЭП), метод Монте-Карло (МК), трансферматричный формализм, техника рекуррентных соотношений, широко используются в изучении таких нестандартных систем [21][22][23][24].…”

Section: Introductionunclassified

Фазовый Переход В Цилиндрических Изинговых Нанопроволоках И Нанотрубках: Приближение Теории Молекулярного Поля

Танрывердиев¹,

Tagiev²,

Абдуллаев³

et al. 2019

Физика Твердого Тела

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Within the approximation of the molecular field theory, the critical behavior of cylindrical Ising nanowires and nanotubes is studied. The model considered in this work consists of ferromagnetic spins S _c situated in the core of the system and ferromagnetic spins S _s situated on the surface wall; they are interconnected by the exchange coupling J _1. The transition temperature T _c for such systems has been calculated as a function of exchange interaction parameters. The influence of the surface exchange interaction and surface coupling on the magnetodynamic behavior of the system have been studied. Some characteristic properties obtained on the phase diagram are related to the ratio of characteristic physical parameters on the surface and core of the abovementioned nanostructures.

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Effects of the Random Crystal Field on the Phase Diagrams and the Magnetic Properties of a Spin-1 Blume-Capel Nanoisland

Magoussi¹,

Kerouad²

2017

J Supercond Nov Magn

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Phase transition in ising magnetic superlattice nanowires: Molecular field theory approach

Cited by 10 publications

References 21 publications

Anomalous thermodynamics in a mixed spin-1/2 and spin-1 hexagonal nanowire system

Anomalous thermodynamics in a mixed spin-1/2 and spin-1 hexagonal nanowire system

Фазовый Переход В Цилиндрических Изинговых Нанопроволоках И Нанотрубках: Приближение Теории Молекулярного Поля

Effects of the Random Crystal Field on the Phase Diagrams and the Magnetic Properties of a Spin-1 Blume-Capel Nanoisland

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