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Antiferromagnetic ordering on the frustrated fee lattice in the intermetallic compound GdPtBi

机译:金属间化合物GdPtBi中失意的电荷晶格上的反铁磁有序

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摘要

The type of antiferromagnetic magnetic order in the half-Heusler intermetallic compound GdPtBi, where the Gd atoms form a magnetically frustrated fee lattice, has been investigated using exchange constants calculated from first principles within the framework of the Green's function based magnetic force theorem. It is found that the degeneracy of the magnetic states on the fee lattice with antiferromagnetic nearest neighbor interaction is removed by strong fourth-nearest neighbor interaction along the cube diagonal. We show that an antiferromagnetic ordering of so-called "third kind" occurs at low temperatures. The Monte Carlo simulations using our derived exchange constants predict an experimental Neel temperature (T_N) with good accuracy. The estimated temperature dependence of the correlation functions in the paramagnetic region exhibit a typical behavior for a frustrated system-a massive short-range order is retained for temperatures which are one order of magnitude higher than T_N.
机译:在基于格林函数的磁力定理的框架内,使用从第一原理计算得出的交换常数,研究了半霍斯勒金属间化合物GdPtBi中的反铁磁磁阶类型,其中Gd原子形成了受磁挫折的电荷晶格。结果发现,沿着立方对角线的强第四近邻相互作用消除了具有反铁磁最近邻相互作用的费格上的磁性态的简并性。我们表明在低温下会发生所谓的“第三类”反铁磁排序。使用我们导出的交换常数进行的蒙特卡洛模拟可以很好地预测实验尼尔温度(T_N)。估计的顺磁性区域中相关函数的温度依赖性表现出对于受挫系统的典型行为-对于比T_N高一个数量级的温度,将保留大量的短程顺序。

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