凝聚态物理
铁磁性
反铁磁性
伊辛模型
磁化
六边形晶格
物理
铁磁性
磁场
材料科学
量子力学
摘要
Molecular field approximation is applied to a triangular Ising lattice with antiferromagnetic nearest neighbor interaction J and ferromagnetic second neighbor interaction J ' to study the magnetic behavior at finite temperatures. In the range of 0> J '/ J >-0.8, with increasing temperature the system is found to have a second-order transition from a ferrimagnetic state to an antiferromagnetic state in which one of three sublattices is completely disordered. Another second-order transition occurs in the ferrimagnetic state. Magnetic structure factor, free energy, magnetic specific heat, differential magnetic susceptibility as well as sub-lattice magnetization are calculated numerically with parameter J '/ J . Critical magnetic field of first-order transition from antiferromagnetic state to ferrimagnetic state is also evaluated. Discussion is given in connection with magnetic ordering in CsCoCl 3 and CsCoBr 3 .
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