在铁磁维尔半金属NiMnSb和PtMnSb中的延长果曲率尾巴
Sukriti Singh1, Ana García-Page1, Jonathan Noky1
1Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|June 18, 2024
概括
在室温铁磁维尔半金属,NiMnSb和PtMnSb,显示异常的霍尔运输. 这些半斯勒材料表现出非微不足道的拓状态和显著的异常霍尔导电性,为螺旋电子学应用铺平了道路.
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
- 这就是Spintronics.
背景情况:
- 豪斯勒化合物以各种物理现象和应用而闻名.
- 铁磁维尔半金属对于自旋电子和记忆器件至关重要.
- 半豪斯勒材料为先进的电子应用提供了潜力.
研究的目的:
- 在NiMnSb和PtMnSb中报告异常的霍尔运输.
- 确定NiMnSb和PtMnSb是第一个表现出Weyl半金属特性的半Heusler铁磁体.
- 为了调查这些材料中异常的霍尔导电性的起源.
主要方法:
- 实验测量异常的霍尔运输.
- 一开始的计算.
- 应用一个简单的模型来理解拓特征.
主要成果:
- NiMnSb和PtMnSb表现出室温铁磁性与高基里温度.
- 这两种材料均具有4μB/f.u.u. 磁时刻和非微不足道的拓状态.
- 测量了显著的异常霍尔导电性 (AHC),归因于贝里曲率和韦尔节点.
结论:
- NiMnSb和PtMnSb被确定为新型半海斯勒铁磁维尔半金属.
- 本质的AHC是由远离费米能量的韦尔节点驱动的.
- 这些发现表明,在高能量的拓特征对AHC贡献有一个可概括的机制,这与自旋电子学有关.
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