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arXiv 2402.01100cond-mat.mes-hallcond-mat.mtrl-sci
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二维5d多铁性W3Cl8:呼吸型Kagome晶格与可调谐磁光克尔效应

Two-dimensional 5d multiferroic W3Cl8: breathing Kagome lattice and tunable magneto-optical Kerr effect

Di Hu, Haoshen Ye, Ning Ding, Kaidi Xu, Shan-Shan Wang, Shuai Dong, Xiaoyan Yao

AI总结:

本研究理论预测了二维多铁性W3Cl8单层材料,揭示其呼吸型Kagome晶格中钨的本征5d磁性与Y型反铁磁基态,发现可调磁光克尔效应,提出二维多铁体系中实现5d磁性的通用方案。

摘要:

重5d过渡金属因具有强自旋轨道耦合及相关的优异物理性质,展现出良好的应用前景。但截至目前,5d磁性材料仍十分有限,钨基的5d磁性材料尤为稀缺。本研究从理论上预测了一种二维多铁性W3Cl8单层材料。在有效维度降低的呼吸型Kagome晶格中,钨离子的分数量级价态激活了钨的本征5d磁性。研究证实,由铁磁性W3三聚体构成的共面Y型反铁磁序是其磁基态。自发铁电极化主要源于Kagome晶格呼吸畸变引发的离子位移。该材料存在本征磁光克尔效应,且具有可观的克尔角,可用于检测这种三聚体型Y型反铁磁性,且该效应强烈依赖于具体的磁有序结构。据此,我们提出了一种在二维多铁体系中实现更多5d磁性的通用方案。

英文摘要:

Owing to the strong spin-orbit coupling and the related fascinating physical properties, heavy 5d transition-metals exhibit desirable application prospects. However, up to now, the 5d magnetic materials are still very limited, especially very rare for tungsten. In this work, we theoretically predict a two-dimensional multiferroic W3Cl8 monolayer. Intrinsic 5d magnetism of tungsten is activated by the W ions' fractional valence in a breathing Kagome lattice of reduced effective dimension. A coplanar Y-type antiferromagnetism composed by ferromagnetic W3 trimers is confirmed as the magnetic ground state. The spontaneous ferroelectric polarization mainly originates from the ion displacement induced by the breathing distortion of Kagome lattice. An intrinsic magneto-optical Kerr effect with sizable Kerr angle can be observed to detect this trimeric Y-type antiferromagnetism, and it depends strongly on the detailed magnetic order. Thereby, we propose a general scheme for realizing more 5d magnetism in two-dimensional multiferroic systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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