Zr-Fe-Ge Kagome体系中的反铁磁相
Antiferromagnetic Phases in Zr-Fe-Ge Kagome Systems
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中文总结 AI 辅助
本文通过第一性原理计算，研究ZrFe₆Ge₆、ZrFe₆Ge₄和ZrFe₆Ge₅三种Kagome化合物的电子结构与磁有序，预测后两者的基态磁结构，指出中子散射实验对验证预测的重要性。
中文摘要 AI 辅助
铁磁Kagome体系中的多种化学取代可产生具有适合拓扑或量子材料性质的电子结构的多样磁相。本文采用第一性原理计算研究磁性Kagome化合物ZrFe₆Ge₆、ZrFe₆Ge₄和ZrFe₆Ge₅的电子结构与磁有序。对于ZrFe₆Ge₆，所得基态磁结构为A型反铁磁（AFM），与现有实验结果一致；预测ZrFe₆Ge₄和ZrFe₆Ge₅的磁基态为共线A型双层AFM结构，具有长周期有序性，涉及铁磁（FM）与AFM层间取向的混合。这类长程磁结构的形成是普遍特征，与特定取代无关。体系中磁矩基本为局域的，仅弱依赖于磁构型，其大小与现有实验估计值吻合良好。因此，可直接验证这些预测的中子散射实验具有特殊重要性。
英文摘要
A wide variety of chemical substitutions in ferromagnetic Kagome systems can lead to diverse magnetic phases with electronic structures suitable for topological or quantum material properties. Here, we study the electronic structure and magnetic orderings using first-principles calculations for the magnetic Kagome compounds ZrFe6Ge6, ZrFe6Ge4, and ZrFe6Ge5. For ZrFe6Ge6, the obtained ground-state magnetic structure is A-type antiferromagnetic (AFM), in agreement with existing experiments. We predicted that the magnetic ground states of ZrFe6Ge4 and ZrFe6Ge5 are collinear A-type bilayer AFM structures with long-period ordering that involves a mix of FM and AFM interlayer orientations. The formation of such long-range magnetic structures appears to be a general feature and is not tied to specific substitutions. The magnetic moments in these systems are largely local and only weakly dependent on the magnetic configuration, with magnitudes in good agreement with available experimental estimates. Neutron scattering experiments, which could provide direct verification of these predictions, are therefore of particular importance.
