The statistical mechanics of spin-1 Ising model with AFM/AFM interactions on a bilayer Bethe lattice

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• 作者：Erhan Albayrak ; Seyma Akkaya ; Tunç ; Cengiz
• 关键词：Spin-1 ; Bethe lattice ; Tricritical ; AFM/AFM ; Bilayer
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2009
• 出版时间：November 2009
• 年：2009
• 卷：321
• 期：22
• 页码：3726-3733
• 全文大小：549 K

文摘

The spin-1 Ising model is studied for the case of antiferromagnetic (AFM)/AFM interactions on the bilayer Bethe lattice by using the pairwise approach for several values of the coordination numbers q=3, 4 and 6 when the layers are linked with the external magnetic fields. The ground state (GS) phase diagrams, thermal variations of the order-parameters and the response functions are studied in detail to obtain the phase diagrams of the model. It was found that the system gives only one Néel temperature, T_N, for q=3. Two T_N's and first-order phase transition temperature, T_t, thus tricritical point, are found and the existence of two T_N's leads to the reentrant behavior when q=4 and 6 for some given system parameters.