Pressure-tunable large anomalous Hall effect of the ferromagnetic kagome-lattice Weyl semimetal Co3Sn2S2
Pressure-tunable large anomalous Hall effect of the ferromagnetic kagome-lattice Weyl semimetal Co3Sn2S2
复制标题
铁磁戈薇晶格Weyl半金属Co3Sn2S2的压力可调大反常霍尔效应
DOI：
10.1103/physrevb.100.165145
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发表时间：
2019
影响因子：
3.7
通讯作者：
Yang Zhaorong
中科院分区：
文献类型：
--
作者：
Chen Xuliang;Wang Maoyuan;Gu Chuanchuan;Wang Shuyang;Zhou Yonghui;An Chao;Zhou Ying;Zhang Bowen;Chen Chunhua;Yuan Yifang;Qi Mengyao;Zhang Lili;Zhou Haidong;Zhou Jianhui;Yao Yugui;Yang Zhaorong
我们报告了一个系统的高压研究磁性拓扑半金属通过测量同步X射线衍射（XRD），磁化强度，电气和霍尔输运结合第一性原理理论计算。在0.2- 50.9GPa的压力范围内，同步辐射X射线衍射没有发现明显的结构相变。我们发现铁磁性和反常霍尔电阻率随压力的增加而单调抑制，并在22 GPa附近几乎消失。反常的霍尔电导率在低温下随压力的变化而非单调变化，涉及原始和紧急Weyl节点之间的竞争。结合第一性原理计算，我们揭示了由于Berry曲率的内禀机制主导的异常霍尔效应在高压下。
We report a systematic high-pressure study of magnetic topological semimetalthrough measurements of synchrotron x-ray diffraction (XRD), magnetization, electrical, and Hall transports combined with first-principle theoretical calculations. No evident trace of structural phase transition is detected through synchrotron x-ray diffraction over the measured pressure range of 0.2–50.9 GPa. We find that the ferromagnetism and the anomalous Hall resistivity are monotonically suppressed as increasing pressure and almost vanish around 22 GPa. The anomalous Hall conductivity varies nonmonotonically against pressure at low temperatures, involving competition between original and emergent Weyl nodes. Combined with first-principle calculations, we reveal that the intrinsic mechanism due to the Berry curvature dominates the anomalous Hall effect under high pressure.