HgMnTe单晶中的巨抗磁效应和磁化阶跃效应
Giant-diamagnetic and magnetization-step effects in HgMnTe monocrystal
摘要：
在Hg $_{1-x}$ Mn $_x$ Te（x $\geq$ 0.16）单晶中，在自旋玻璃（SG）区域观察到巨抗磁性（GDM）和磁化阶跃现象。GDM的磁化率约为经典抗磁材料的100-1000倍。可以解释为：由于Hg $_{1-x}$ Mn $_x$ Te中的长程反铁磁（AF）交换相互作用和Mn $^{2+}$离子的非均匀随机分布，在低于临界温度和磁场的情况下，准静态自旋波形成并产生GDM现象。同时，在一个基于XY模型的二维AF簇中，通过蒙特卡罗模拟验证了该理论。因此，在SG态中出现长程磁有序结构是可能的。
英文摘要：
In Hg$_{1-x}$Mn$_x$Te (x$\geq$0.16) monocrystal, the giant-diamagnetic (GDM) and magnetization-step phenomena have been observed in spin glass (SG) regime. The susceptibility of GDM is about 100-1000 times than that of classic diamagnetic. It can be interpreted that: due to the long-range antiferromagnetic (AF) exchange interactions and the non-uniform random distribution of Mn$^{2+}$ ions in Hg$_{1-x}$Mn$_x$Te, a quasi-static spin wave forms and produces the GDM phenomenon below the critical temperature and magnetic field. Meanwhile, this theory is proved by Monte Carlo simulations in a two-dimensional AF cluster based on XY model. Hence, it is possible to emerge long-range magnetic order structure in SG state.
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