在 kagome Mn3-xSn 中引发的拓学霍尔效应是由于Mn-缺陷诱导的非平面旋转结构而引起的
Achintya Low1, Susanta Ghosh1, Setti Thirupathaiah1
1Department of Condensed Matter and Materials Physics, S. N. Bose National Centre for Basic Sciences, Kolkata, West Bengal 700106, India.
概括
磁性拓半金属如Mn2.8Sn在室温下表现出很大的拓霍尔效应 (THE),这是由于它们独特的旋转结构. 铁剂进一步调整这些拓性质,以满足潜在的应用.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 量子材料是一种量子材料.
背景情况:
- 磁性拓半金属表现出异国情调的电子和磁性特性.
- 电子和磁相之间的相互作用导致异常霍尔效应 (AHE) 和拓霍尔效应 (THE) 等现象.
- Mn3Sn是一种磁性韦尔半金属,具有Kagome网格,以其拓特征而闻名.
研究的目的:
- 在室温下研究Mn-缺乏Mn3Sn的拓霍尔效应 (THE).
- 探索非平面旋转结构在诱导TH的作用.
- 检查Fe剂对Mn3Sn.的拓性质的影响.
主要方法:
- 合成和表征Mn2.8Sn (6%的Mn缺乏Mn3Sn).
- 在不同的平面 (xy和zx) 中测量霍尔效应 (THE和AHE).
- 系统地将Mn3Sn与铁 (Mn3-xFexSn) 合以调整其性能.
主要成果:
- 在xy平面的室温下,在Mn2.8Sn中观察到一个很大的拓霍尔效应 (THE),尽管它具有反铁磁性.
- 该研究确定了一种非平面的旋转结构,由磁晶异质性诱导,是观察到的TH的原因.
- 在拓性质中发现了显著的异构性,在zx平面中观察到一个很大的异常霍尔效应 (AHE).
- 铁注 (x=0.2,0.25,0.35) 已被证明可以有效调整拓性质.
结论:
- 缺乏Mn的Mn3Sn表现出显著的室温拓霍尔效应,这是由非 coplanar 旋转纹理驱动的.
- 这些材料的拓性质具有高度的异构性,可以通过元素兴奋剂来调节.
- 这些发现为潜在的室温拓波电子装置应用铺平了道路.
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