在高压下Mn3Sn海斯勒化合物的结构稳定性
Junran Zhang1,2, Yunhao Lu3, Yanchun Li4
1Research Institute of Fudan University in Ningbo, 901-C1, Binhan Road No. 2, Ningbo Hangzhouwan District, Zhejiang 315336, People's Republic of China.
概括
高压不会改变锡 (Mn3Sn) 的六角晶体结构,高达50.4GPa. 这种由电子行为驱动的结构稳定性对于可靠的自旋电子设备至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 固态化学 固态化学
背景情况:
- 压力工程是理解分层材料的关键.
- 材料中的结构属性关系对外部条件敏感.
- 锡 (Mn3Sn) 是一种具有潜在自旋电子应用的分层材料.
研究的目的:
- 研究高压对Mn3Sn晶体结构的影响.
- 确定Mn3Sn六角相的压力稳定范围.
- 将电子结构与在压力下观察到的结构行为相关联.
主要方法:
- 在现场高压X射线衍射实验.
- 密度函数理论 (DFT) 的计算.
- 对格子常数和细胞形状稳定性的分析.
主要成果:
- 从环境压力到50.4 GPa,Mn3Sn保留了六角格子对称性.
- c/a格子常数比在0.80保持不变,表明稳定的细胞形状.
- DFT揭示了Fermi水平附近的d电子的平面能量波段和很大的状态密度 (DOS).
结论:
- 在高压下,Mn3Sn具有显著的结构稳定性.
- 电子结构,特别是大型DOS,对相位过渡产生能量屏障.
- 证实了Mn3Sn的坚固性,有利于开发稳定的自旋电子设备.
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