正方晶格上次近邻耦合的混合伊辛亚铁磁体
Mixed Ising ferrimagnets with next-nearest neighbour couplings on square lattices
摘要：
我们研究伊辛亚铁磁体的正方形晶格与反铁磁交换值S=1/2和S=1的自旋之间的耦合在相邻网站，S=1自旋之间的耦合在下一个最近的相邻网站的晶格，和一个单一的网站各向异性项S=1自旋。主要使用基态的考虑和广泛的蒙特卡罗模拟，我们调查的相图，包括补偿点，临界性能，和温度依赖的异常的各个方面。与以前的信念相反，下一个-最近邻耦合，反铁磁类型时，可能会导致补偿点。
英文摘要：
We study Ising ferrimagnets on square lattices with antiferromagnetic exchange couplings between spins of values S=1/2 and S=1 on neighbouring sites, couplings between S=1 spins at next--nearest neighbour sites of the lattice, and a single--site anisotropy term for the S=1 spins. Using mainly ground state considerations and extensive Monte Carlo simulations, we investigate various aspects of the phase diagram, including compensation points, critical properties, and temperature dependent anomalies. In contrast to previous belief, the next--nearest neighbour couplings, when being of antiferromagnetic type, may lead to compensation points.
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