Electronic correlations in the van der Waals ferromagnet Fe3GeTe2 revealed by its charge dynamics

M. Corasaniti, Run Yang, K. Sen, K. Willa, M. Merz, A. Haghighirad, M. L. Tacon, L. Degiorgi
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引用次数: 6

Abstract

The layered van der Waals ferromagnetic Fe$_3$GeTe$_2$ harbours an unconventional interplay between topology and magnetism, leading to a large anomalous Hall conductivity at low temperatures. Here, we investigate the temperature dependence of its charge dynamics and reveal that upon entering the ferromagnetic state at $T_C \sim 200$ K and further lowering the temperature there is the onset of a gradual spectral weight reshuffling from the mid-infrared range towards far- as well as near-infrared frequencies. This two-fold spectral weight transfer indicates the important role of the Hund's coupling as primary source for electronic correlations and signals an incoherent-coherent crossover at low temperatures. Our findings also convey the electronic environment, based on nodal-line topological states, favouring the large anomalous Hall conductivity.
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范德华铁磁体Fe3GeTe2电荷动力学揭示的电子相关性
层状范德华铁磁Fe$_3$GeTe$_2$在拓扑和磁性之间具有非常规的相互作用,导致在低温下具有较大的异常霍尔电导率。在这里,我们研究了其电荷动力学的温度依赖性,并发现在$T_C \sim 200$ K下进入铁磁状态并进一步降低温度后,光谱权重从中红外范围逐渐向远红外和近红外频率重组。这种两倍谱权转移表明了洪德耦合作为电子相关和低温下非相干相干交叉信号的主要来源的重要作用。我们的发现也传达了电子环境,基于节点线拓扑状态,有利于大的异常霍尔电导率。
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