论文标题
范德华（Van der Waals Feromagnet Fe $ _5 $ gete $ _2 $）的异常电阻率上升
Anomalous resistivity upturn in the van der Waals ferromagnet Fe$_5$GeTe$_2$
论文作者
论文摘要
Fe $ _5 $ gete $ _2 $（n = 3，4，5）最近由于其二维范德华的特征和高温铁磁作用而引起了人们的关注，这对Spintronic设备做出了承诺。 Fe（1）拆分站点是Fe $ _5 $ gete $ _2 $的一个重要结构特征，这使其与其他Fe $ _5 $ gete $ _2 $（n = 3，4）系统截然不同。分裂部位可以诱导局部原子障碍和短期顺序。在这项工作中，高质量的Van der Waals Ferromagnet Fe $ _5 $ gete $ _2 $被种植以研究低温运输属性。我们发现电阻率在10 K以下的电阻率上升。电阻率的温度和磁场依赖性非常吻合，这与无效增强的三维电子电子和单渠道临床效应的结合。仅在低磁场B <3 t下存在近多效应，而电子电子效应则占据了低温电阻率上升的外观。我们认为，由于Fe（1）的分裂位点，该系统中的增强的三维电子电子相互作用是由局部原子结构障碍引起的。我们的结果表明，FE的分裂位点对于特殊运输特性起着重要作用。
Fe$_5$GeTe$_2$ (n = 3, 4, 5) have recently attracted increasing attention due to their two-dimensional van der Waals characteristic and high temperature ferromagnetism, which make promises for spintronic devices. The Fe(1) split site is one important structural characteristic of Fe$_5$GeTe$_2$ which makes it very different from other Fe$_5$GeTe$_2$ (n = 3, 4) systems. The local atomic disorder and short-range order can be induced by the split site. In this work, the high-quality van der Waals ferromagnet Fe$_5$GeTe$_2$ were grown to study the low-temperature transport properties. We found a resistivity upturn below 10 K. The temperature and magnetic field dependence of the resistivity are in good agreement with a combination of the theory of disorder-enhanced three-dimensional electron-electron and single-channel Kondo effect. The Kondo effect exists only at low magnetic field B < 3 T, while electron-electron dominates the appearance for the low-temperature resistivity upturn. We believe that the enhanced three-dimensional electron-electron interaction in this system is induced by the local atomic structural disorder due to the split site of Fe(1). Our results indicate that the split site of Fe plays an important role for the exceptional transport properties.
