混合自旋S=（1/2，1）Ising铁磁体的Monte Carlo研究
Monte Carlo Study of Mixed-Spin S=(1/2,1) Ising Ferrimagnets
摘要：
我们调查伊辛亚铁磁体的正方形和简单立方晶格与交换耦合值S=1/2和S=1的相邻网站和一个额外的单网站上的S=1网站的各向异性项之间的自旋。主要基于一个仔细和全面的蒙特卡罗研究，我们得出结论，有没有三临界点在二维的情况下，在矛盾的平均场的预测和最近的系列结果。然而，在三维情况下发现了三临界点的证据。此外，对于简单立方晶格，我们发现了一条补偿点线，而对于正方形晶格，我们没有发现。
英文摘要：
We investigate Ising ferrimagnets on square and simple-cubic lattices with exchange couplings between spins of values S=1/2 and S=1 on neighbouring sites and an additional single-site anisotropy term on the S=1 sites. Based mainly on a careful and comprehensive Monte Carlo study, we conclude that there is no tricritical point in the two--dimensional case, in contradiction to mean-field predictions and recent series results. However, evidence for a tricritical point is found in the three-dimensional case. In addition, a line of compensation points is found for the simple-cubic, but not for the square lattice.
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