铁磁主义的演变与格里菲斯奇点在酸鲁酸中的奇点对比
Pooja Kesarwani1, Sachindra Nath Sarangi2, D Samal2,3
1Department of Physics, Indian Institute of Technology, Kanpur 208016, India.
概括
在鲁酸 (CaRuO3) 中的兴奋剂诱导铁磁性和磁性集群,改变其电子特性. 这项研究揭示了CaRu1-xCrxO3的新相图,突出了兴奋剂对相关电子系统的影响.
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:
- 氨酸 (CaRuO3) 在量子临界点附近表现出复杂的磁性.
- 了解结构,磁力和电子运输之间的相互作用对于相关的电子系统至关重要.
研究的目的:
- 研究 (Cr) 兴奋剂对CaRuO3.3的结构,磁性和运输特性的影响.
- 阐明出现的磁相和电子转换背后的机制.
主要方法:
- 单晶CaRu1-xCrxO3的合成和表征.
- 结构性,磁性 (SQUID磁力测量),光谱 (XPS) 和电传输测量的详细分析.
- 温度组合 (T-x) 阶段图的构造.
主要成果:
- doping 降低了 orthorhombicity,并在低 doping 水平 (x=0.01) 上诱导从类磁性向铁磁性基本状态的过渡.
- 在较高的兴奋剂 (x=0.05) 中观察到的磁团和格里菲斯奇点的形成,由"七原子"铁磁团解释.
- 向非金属状态的逐渐演变,含Cr量增加,在x >= 0.1.1.时表现出Mott-VRH导电.
- XPS研究证实了混乱和电子相关性在减少电子漫游中的重要作用.
结论:
- doping 提供了一个调整 CaRuO3.3 的磁性和电子性质的途径.
- 该研究建立了一个全面的T-x相位图,映射磁性和电子相位过渡.
- 结果提供了对相关电子系统和潜在应用的基本物理学的见解.
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