Magnetization process of a disordered phase in a mixed-bond spin-1 Ising ferromagnet

The ground-state magnetic properties of the spin-2 transverse Ising model with a longitudinal crystal field are studied within the framework of mean-field theory (MFT) and effective-field theory (EFT), respectively. The phase diagrams and magnetization curves are examined in detail. It is found that the system exhibits a tricritical behavior in the ground-state phase diagrams. Some interesting phenomena have been found, especially the first-order phase transition from one ordered phase to the other ordered phase, which is due to the high spin. The spin correlation has important effect on the magnetic properties of the system. We also find that the ground-state phase diagrams of the spin-2 transverse Ising model are very different from those of the spin-3/2 transverse Ising model. r

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Section: Introductionmentioning

confidence: 99%

Ground-state magnetic properties of the spin-2 transverse Ising model

Wei

Miao

Liu

et al. 2008

Journal of Magnetism and Magnetic Materials

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“…[28,29]. For instance, in the previous approaches to the Gibbs energy for H-K method the equations for the first derivatives (22) and (26) could not be simultaneously fulfilled with the extremum condition (22). In contrast, the present approach enables all the thermodynamic quantities to be calculated as the successive derivatives of the Gibbs free-energy.…”

Section: Article In Pressmentioning

confidence: 76%

“…(26), (28), and (30), (33) allow us to study the basic properties of the model from the free-energy expression, whereas the equilibrium condition (22), and the existing EFT equations in H-K approximation (8), (11), remain fulfilled.…”

Section: The Gibbs Free-energymentioning

confidence: 99%

“…In the equivalent, integral operator version, the method has been applied to studies of thin magnetic films [20,21]. At the same time, great efforts were put into application of H-K method to higher spins problem [22,23]. In this area, both the pure spin models (containing the spins of the same kind), for instance the isotropic Blume-Emery-Griffiths model [24], as well as the mixed-spin systems [6,25] have been considered.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamics of the small clusters: The Gibbs free-energy derivation for the Honmura–Kaneyoshi method

Balcerzak

2008

Journal of Magnetism and Magnetic Materials

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“…Much effort has been devoted to investigate the criticality and other statistical properties of various Ising systems [1][2][3], which would enable a deeper understanding of ordered-disordered phenomena in statistical physics. An ideal metamagnet is made up of identical plane layers of spins, with ferromagnetic couplings between the spins in each layer but antiferromagnetic couplings between adjacent layers.…”

Section: Introductionmentioning

confidence: 99%