Anomalous Hall effect triggered by pressure-induced magnetic phase transition in α-Mn
Anomalous Hall effect triggered by pressure-induced magnetic phase transition in α-Mn
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α-Mn 中压力诱导磁相变引发的反常霍尔效应
DOI：
10.1103/physrevresearch.2.043090
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
T. C. Kobayashi
中科院分区：
文献类型：
--
作者：
K. Akiba;K. Iwamoto;T. Sato;S. Araki;T. C. Kobayashi
最近对凝聚态物理拓扑性质的兴趣揭示了贝里曲率在反常霍尔效应（AHE）中的重要作用。然而，由于贝里曲率引起的大霍尔响应在相当有限的材料中被报道，目前详细的机制仍不清楚。在这里，我们报告了元素锰中压力诱导磁相变触发的大 AHE 的发现。在环境压力下，非共线反铁磁相中不存在AHE，而在高压下的弱铁磁相中，尽管/Mn的磁化强度较小，但观察到较大的AHE。我们的结果表明，AHE in-Mn 的出现是由底层磁结构的对称性控制的，这提供了跨越相界的贝里曲率在零和非零贡献之间切换的直接证据。-Mn 可以成为揭示贝里曲率在 AHE 中的作用的元素和可调平台。
Recent interest in topological nature in condensed matter physics has revealed the essential role of Berry curvature in the anomalous Hall effect (AHE). However, since a large Hall response originating from Berry curvature has been reported in quite limited materials, the detailed mechanism remains unclear at present. Here, we report the discovery of a large AHE triggered by a pressure-induced magnetic phase transition in elemental-Mn. The AHE is absent in the noncollinear antiferromagnetic phase at ambient pressure, whereas a large AHE is observed in the weak ferromagnetic phase under high pressure despite the small magnetization of/Mn. Our results indicate that the emergence of the AHE in-Mn is governed by the symmetry of the underlying magnetic structure, providing a direct evidence of a switch between a zero and nonzero contribution of the Berry curvature across the phase boundary.-Mn can be an elemental and tunable platform to reveal the role of Berry curvature in AHE.