Local mean field study of two-sublattice frustrated Ising systems

Hung, Tran Quang; Li, Mai Suan; Cieplak, Marek

doi:10.1016/0304-8853(94)90412-x

Cited by 4 publications

(1 citation statement)

References 29 publications

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“…Previous studies of the same problem but within other models such as the long range interaction SK model [5] and a short range model [9] have given mostly the same qualitative results as found here. Finally, we remark that comparison of the results of SK related models with experiments is still a controversial subject [10] and should be seen with caution.…”

Section: Phase Diagrams Magnetization and Discussion Of The Resultssupporting

confidence: 81%

Magnetic Properties of the Antiferromagnetic Random Energy Model

Almeida

1998

phys. stat. sol. (b)

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The two-sublattices random energy model (REM) with antiferromagnetic interactions is solved, its phase diagram and magnetic properties being worked out. Paramagnetic, antiferromagnetic, spin glass, and mixed spin glass±antiferromagnetic phases are obtained. The total magnetization as a function of temperature and external field exhibits a peculiar behaviour in qualitative agreement with recent experimental results.

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Section: Phase Diagrams Magnetization and Discussion Of The Resultssupporting

confidence: 81%

Magnetic Properties of the Antiferromagnetic Random Energy Model

Almeida

1998

phys. stat. sol. (b)

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Nanophase separation in CoSb‐based half‐Heusler thermoelectrics: A multiscale simulation study

Mena

Schoberth

Gruhn

et al. 2015

Physica Status Solidi (a)

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If cooled down from high temperatures, some half‐Heusler alloys based on CoTiSb show a spontaneous phase separation into coexisting domains. In thermoelectric applications, this domain structure is beneficial for the efficiency because it reduces the lattice thermal conductivity, which increases the figure of merit. For this reason, it is of great relevance to understand the details of the demixing phenomenon. We combine density functional theory, Monte Carlo simulations, and mean field calculations in order to investigate the demixing behavior of CoTi1−xZxSb with Z= Sc, V, Cr, Mn, Fe, Cu. Based on the calculations we present phase diagrams, which provide the coexistence region of the materials. Density functional theory results show that for low temperatures, demixed states are more stable than mixed ones. With the help of an ab initio‐based cluster expansion of the configurational energy, we can perform mean field calculations and Monte Carlo simulations to study half‐Heusler alloys at higher temperature on a larger scale. With the mean field calculations, the coexistence region and the spinodal can be determined for regions far from the critical point. The Monte Carlo simulations help to improve the coexistence lines and provide insights into structures formed in alloys that are quenched into the coexistence region.

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Miscibility Gap in the Phase Diagrams of Thermoelectric Half-Heusler Materials CoTi $$_{1-x}Y_x$$ 1 - x Y x Sb (Y = Sc, V, Mn, Fe)

Mena

Rausch

Ouardi

et al. 2015

Journal of Elec Materi

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The half-Heusler system CoTi 1Àx Y x Sb (Y = Sc, V, Mn, Fe) has been investigated by means of an ab initio-based mean-field model which provides phase diagrams of alloys. Co(Ti,Y)Sb materials show a miscibility gap, which leads to spontaneous demixing within a spinodal region. The results are compared with experimental investigations of microstructure and transport properties of the alloys. The thermoelectric properties of the solid solution were investigated comprehensively by measuring the temperature dependence of the Seebeck coefficient as well as electrical and thermal conductivity. Compared with pure CoTiSb, the thermal conductivity of substituted CoTi 0:9 Y 0:1 Sb was significantly reduced by approximately 53% for Y = V. Here, we report on the effect of phase separation in the Co(Ti,Y)Sb system and its consequences for the thermoelectric figure or merit.

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Local mean field study of two-sublattice frustrated Ising systems

Cited by 4 publications

References 29 publications

Magnetic Properties of the Antiferromagnetic Random Energy Model

Magnetic Properties of the Antiferromagnetic Random Energy Model

Nanophase separation in CoSb‐based half‐Heusler thermoelectrics: A multiscale simulation study

Miscibility Gap in the Phase Diagrams of Thermoelectric Half-Heusler Materials CoTi $$_{1-x}Y_x$$ 1 - x Y x Sb (Y = Sc, V, Mn, Fe)

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