Observation of planar Hall effect in the topological insulator NaCd4As3

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED Applied Physics Letters Pub Date : 2024-11-11 DOI:10.1063/5.0233091

Haiyang Yang, Yonghui Zhou, Jing Wang, Ying Zhou, Yuyan Han, Jialu Wang, Yuke Li, Xuefeng Zhang, Zhaorong Yang

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Abstract

The observation of the planar Hall effect (PHE) illuminates the spin textures and topological properties of materials, indicating potential applications in quantum computing and electronic devices. Here, we present a study on the planar Hall transport of topological insulator NaCd4As3 single crystals. When the magnetic field is rotated within the sample plane relative to the current direction, we observe remarkable planar Hall resistivity and giant planar anisotropic magnetoresistance (AMR), both consistent with the theoretical expression of the PHE. Further analysis reveals that the orbital magnetoresistance effect, unrelated to surface electrons from topological surface states or bulk electrons from nontrivial Berry phases, lays a dominant role in the PHE in NaCd4As3. Additionally, the AMR ratio reaches −43% at 3 K under 14 T and remains −9% at room temperature, markedly exceeding that of traditional ferromagnetic metals. These findings provide a platform for understanding the PHE mechanism in topological insulators and highlight the potential of NaCd4As3 for angle and magnetic field detection applications.

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拓扑绝缘体 NaCd4As3 中的平面霍尔效应观测

平面霍尔效应（PHE）的观测揭示了材料的自旋纹理和拓扑特性，预示着其在量子计算和电子设备中的潜在应用。在此，我们介绍了拓扑绝缘体 NaCd4As3 单晶的平面霍尔传输研究。当磁场在样品平面内相对于电流方向旋转时，我们观察到显著的平面霍尔电阻率和巨大的平面各向异性磁阻（AMR），两者都与 PHE 的理论表达相一致。进一步的分析表明，轨道磁阻效应在 NaCd4As3 的 PHE 中起着主导作用，它与拓扑表面态的表面电子或非三相贝里相的体电子无关。此外，在 14 T 条件下，AMR 比率在 3 K 时达到 -43%，在室温下保持 -9%，明显超过了传统铁磁金属的 AMR 比率。这些发现为理解拓扑绝缘体中的 PHE 机制提供了一个平台，并凸显了 NaCd4As3 在角度和磁场检测应用方面的潜力。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.