论文标题
浆果曲率在磁拓扑氧化物双钙钛矿SR2FEMOO6中诱导异常霍尔电导率
Berry curvature induced anomalous Hall conductivity in magnetic topological oxide double perovskite Sr2FeMoO6
论文作者
论文摘要
氧化物材料表现出几种新型的结构，磁性和电子特性。它们在环境条件下，易于合成和高过渡温度的稳定性为实现拓扑特性和现实生活中的技术应用提供了理想的基础。但是，很少有氧化物材料中拓扑状态的实验证据。在这项研究中，我们合成了氧化双钙钛矿SR2FEMOO6的单晶体，并通过研究其结构，磁性和电子特性来揭示其拓扑性质。我们观察到该系统在立方空间组FM-3M中结晶，这是半金属的铁磁铁。运输测量结果显示出异常的大厅效应，很明显，大厅的贡献起源于浆果曲率。假设Fermi能量向传统带转移，由于存在凝结的淋巴结线，异常霍尔效应的贡献会增强。这项研究可用于探索和实现大量氧化物系统的拓扑特性。
Oxide materials exhibit several novel structural, magnetic, and electronic properties. Their stability under ambient conditions, easy synthesis, and high transition temperatures provide such systems with an ideal ground for realizing topological properties and real-life technological applications. However, experimental evidence of topological states in oxide materials is rare. In this study, we have synthesized single crystals of oxide double perovskite Sr2FeMoO6 and revealed its topological nature by investigating its structural, magnetic, and electronic properties. We observed that the system crystallized in the cubic space group Fm-3m, which is a half-metallic ferromagnet. Transport measurements show an anomalous Hall effect, and it is evident that the Hall contribution originates from the Berry curvature. Assuming a shift of the Fermi energy towards the conduction band, the contribution of the anomalous Hall effect is enhanced owing to the presence of a gaped nodal line. This study can be used to explore and realize the topological properties of bulk oxide systems.
