在缺乏氧气的V2O5纳米粒子中,多种磁相互作用的共存
Tathagata Sarkar1, Soumya Biswas1, Sonali Kakkar2
1School of Physics, Indian Institute of Science Education Research Thiruvananthapuram, Maruthamala PO, Vithura, Trivandrum, Kerala, 695551, INDIA.
Journal of physics. Condensed matter : an Institute of Physics journal
|September 3, 2024
概括
缺氧的V2O5纳米粒子由于缺陷而表现出类似自旋玻璃的磁性行为. 这项研究揭示了这些纳米材料中的竞争性磁性顺序和磁电子相位分离.
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
- 纳米技术纳米技术
背景情况:
- 缺氧的氧化 (V2O5) 纳米粒子具有复杂的磁性.
- 了解缺陷和磁性排序之间的相互作用对于新型电子应用至关重要.
研究的目的:
- 为了研究在缺乏氧气的V2O5纳米粒子中竞争性磁顺序的旋转玻璃般的共存.
- 阐明氧气空缺和V4+缺陷在观察到的磁现象中的作用.
主要方法:
- 用于表面石化测量的X射线光电子光谱 (XPS).
- 温度依赖的电导率和热功率测量.
- SQUID磁力测量用于磁性行为.
- 电子磁共振 (EPR) 和中子衍射用于结构和磁性分析.
主要成果:
- 由于缺陷密度很高,表面固体测量显示为V2O4.65.
- 观察到的极子导电机制具有0.112 eV的跳跃能量.
- 旋转玻璃般的行为与歇斯底里,表明竞争的磁顺序 (FM,AFM,PM).
- 由氧空隙和V4+缺陷驱动的磁电子相位分离 (MEPS).
- 中子衍射证实没有远程磁性排序,与极子星团类似的FM和MEPS相一致.
结论:
- 在V2O5纳米颗粒中的氧气空缺诱导V4+缺陷,导致MEPS和各种磁性交换.
- 缺陷的随机分布导致一个复杂的磁场景,具有局部自旋,FM集群和AFM相互作用.
- 这一发现有助于我们更好地理解未使用兴奋剂的,非磁性氧化物系统中的磁性行为.
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