高温铁磁秩序触发了CaCu3Ni2Os2O12中的金属到绝缘体的过渡
Xubin Ye1, Yunyu Yin1,2, Yingying Cao1,2
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China.
Nature communications
|April 21, 2025
概括
研究人员发现了一种新材料,CaCu3Ni2Os2O12,它表现出由室温以上的铁磁顺序驱动的金属到绝缘体过渡 (MIT). 这一发现对于开发先进的自旋电子设备至关重要.
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:
- 铁磁秩序通常会诱导绝缘体到金属的过渡.
- 由自发磁化驱动的金属到绝缘体过渡 (MIT),特别是在室温以上,是罕见的.
- 呈现这种过渡的磁电材料对于低损耗电子和自旋电子设备至关重要.
研究的目的:
- 为了合成和表征一种新的3d/5d杂交的四重矿氧化物.
- 为了研究铁磁顺序和这种材料中的金属到绝缘体过渡之间的关系.
- 探索这种材料在先进电子和自旋电子应用中的潜力.
主要方法:
- 新型四重矿氧化物的合成,CaCu3Ni2Os2O12.
- 描述其磁性特性,包括基里温度和磁化.
- 从金属到绝缘体的过渡机制的实验和理论研究.
主要成果:
- 合成的材料CaCu3Ni2Os2O12表现出长距离Cu2+(↑) -Ni2+(↑) -Os6+(↓) 铁磁秩序,其基里温度高 (393K).
- 观察到金属到绝缘体的过渡 (MIT) 与在基里温度下铁磁排序的同时发生.
- 理论分析表明,铁磁顺序重新规范了电子带结构,通过Lifshitz型机制,受电子相关性和旋转轨道合的影响,导致MIT.
结论:
- CaCu3Ni2Os2O12作为一种范式材料,可以通过铁磁自发磁化在高温下诱导金属到绝缘体的过渡.
- 这一发现为开发用于先进的自旋电子和电子应用的新型磁电材料开辟了道路.
- 这些发现强调了混合电子结构和磁性排序在调整材料特性中的重要作用.
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