Ni1-xVx合金在量子临界点周围和远离量子临界点的结构和物理特性
Jaskirat Brar1, Swati Pathak1, S Khalid2
1School of Physical Sciences, Indian Institute of Technology Mandi, Kamand, Himachal Pradesh 175005, India.
概括
合金中的兴奋剂抑制铁磁性,诱导量子相位过渡. 局部结构扭曲与磁性障碍相关,突出了结构和量子波动之间的相互作用.
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:
- - (Ni-V) 合金是具有复杂磁性和电子性质的技术相关材料.
- 了解结构性,磁性和传输性之间的相互作用对于设计新功能材料至关重要.
研究的目的:
- 在室温和不同温度下研究Ni$_{1-x}$V$_x$合金 (0 ≤ x ≤ 0.13) 的结构,磁性和运输行为.
- 探索兴奋剂对全球和本地结构,磁性排序和电子运输的影响.
- 识别和描述这些合金中的量子相变和格里菲斯相等现象.
主要方法:
- 对X射线的能量分散分析 (EDAX) 用于组合分析.
- 在室温下进行全球结构分析的X射线衍射 (XRD).
- 对温度依赖行为的磁性易感性,热容量和电电阻测量.
- 尼克边缘X射线吸收光谱 (XAS) 用于局部结构分析.
主要成果:
- 准备了固体测量Ni$_{1-x}$V$_x$合金,在室温下稳定在面中心立方结构中.
- 在 x = 0.12 周围观察到量子相位过渡,抑制铁磁相位,在这种组合附近具有不寻常的晶格参数行为.
- 在量子临界点的两侧检测到格里菲斯相位特征,在x = 0.1和临界点附近观察到线性T依赖电阻,与费米液态行为不同.
- 基边缘XAS在兴奋剂时发现了第一个协调数的显著减少和基原子周围的扭曲,表明了局部和全球结构之间的分歧.
- 在低温下,发现了局部结构扭曲程度和磁性障碍之间的直接相关性.
结论:
- 在Ni$_{1-x}$V$_x$合金中的兴奋剂驱动量子相位过渡,并修改全球和本地结构性质.
- 观察到的运输行为表明,量子临界点周围和远离量子临界点的不同起源.
- 这项研究强调了局部结构障碍和磁性波动之间的强烈联系,激励了进一步研究它们在原子层面的相互作用.
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