电荷分布在封闭和未封闭的无限层新尼基酸薄膜中
Aravind Raji1,2, Guillaume Krieger3, Nathalie Viart3
1Laboratoire de Physique des Solides, CNRS, Université Paris-Saclay, Orsay, 91405, France.
Small (Weinheim an der Bergstrasse, Germany)
|August 18, 2023
概括
研究了NdNiO2薄膜中的电荷订单. 封闭的膜显示稳定无限层结构,而未封闭的膜显示与氧气重新插曲和孔 doping 相关的电荷顺序.
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
- 固态化学 固态化学
背景情况:
- 电荷排序 (CO) 是强烈相关的电子系统中的一个关键现象.
- 了解CO在高温超导中的作用至关重要.
- NdNiO2薄膜是研究这些现象的重要系统.
研究的目的:
- 为了阐明 NdNiO2 薄膜中的结构和电荷分布.
- 为了比较带有和没有封装层的薄膜,以了解CO的存在/不存在.
- 调查结构变化,氧气和二氧化碳之间的联系.
主要方法:
- 扫描传输电子显微镜 - 电子能量损失光谱 (STEM-EELS).
- 硬X射线光辐射光谱学 (HAXPES).
- 4D-STEM分析. 这是一个很好的方法.
主要成果:
- 覆盖的NdNiO2薄膜显示Ni(1+) 和一个稳定的外平面格子参数 (~3.30 Å).
- 没有封闭的薄膜显示出增加的外平面格子参数 (~3.65 Å) 和Ni对Ni的值 (~2+).
- 4D-STEM在未加盖的薄膜中发现了 (303) 定向的条纹,与氧气重新插曲和穴位兴奋剂有关.
结论:
- 覆盖层稳定了 NdNiO2 薄膜中的无限层结构.
- 在未封闭的薄膜中重新插入氧气和孔 doping 与充电顺序相关.
- 这些发现表明结构调制与无限层酸盐中的CO之间存在潜在的联系.
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