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arXiv 2011.12330cond-mat.stat-mech
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广义自旋-S磁性二元合金的Phase Diagrams

Phase Diagrams of Generalized Spin-S Magnetic Binary Alloys

Gülşen Karakoyun, Ümit Akıncı

摘要:

在EFT框架下研究了以$A_{c}B_{1-c}$为代表的广义自旋S磁性二元合金的临界性质。通过考察几种自旋值下相图随浓度的演化,得到了一般性的结果。所得结果涵盖了文献中特殊情况下的结果。一般自旋模型的过渡类型(一/二阶),以及三临界点的存在已被确定。对于由半整数-整数自旋合金组成的二元合金,无论其自旋值如何,系统中存在相同的临界浓度值。

英文摘要:

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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