论文标题
Ni取代的磁性Weyl半co3sn2s2中的固有异常霍尔效应
Intrinsic anomalous Hall effect in Ni-substituted magnetic Weyl semimetal Co3Sn2S2
论文作者
论文摘要
拓扑材料最近在材料科学家中引起了极大的关注，因为预计其特性将受到侵扰，例如晶格失真和化学替代。但是，仍然缺乏这种鲁棒性的任何实验证明。在这项研究中，我们在实验上证明了铁磁性kagome化合物CO3SN2S2的拓扑特性可在NI取代后保留。我们系统地改变了CO3SN2S2单晶的Ni含量，并研究了它们的磁性和异常运输特性。对于中间的NI取代，我们观察到强制性场的显着增加，同时仍保持明显的异常霍尔电导率。这些化合物的大型霍尔电导率是固有的，与第一原则计算一致，这证明了其拓扑起源。我们的结果可以指导有关拓扑材料化学调整的进一步研究，以更好地理解。
Topological materials have recently attracted considerable attention among materials scientists as their properties are predicted to be protected against perturbations such as lattice distortion and chemical substitution. However, any experimental proof of such robustness is still lacking. In this study, we experimentally demonstrate that the topological properties of the ferromagnetic kagome compound Co3Sn2S2 are preserved upon Ni substitution. We systematically vary the Ni content in Co3Sn2S2 single crystals and study their magnetic and anomalous transport properties. For the intermediate Ni substitution, we observe a remarkable increase in the coercive field while still maintaining significant anomalous Hall conductivity. The large anomalous Hall conductivity of these compounds is intrinsic, consistent with first-principle calculations, which proves its topological origin. Our results can guide further studies on the chemical tuning of topological materials for better understanding.
