压力对石磁性秩序的影响
Ryan A Klein1, James P S Walsh1, Samantha M Clarke1
1Department of Chemistry , Northwestern University , Evanston , Illinois 60208 , United States.
Journal of the American Chemical Society
|August 1, 2018
概括
施加压力到一个有kagomé格子的矿物质, 揭示了它的结构如何影响磁性秩序. 这项研究表明压力极大地提高了磁体的温度,
科学领域:
- 凝聚物质物理学
- 矿物物理
- 磁性
背景情况:
- 石是一种卡戈米格子矿物质,具有磁性挫折,磁性低于65K.
- 了解石的复杂磁性和磁性合相互作用是一个长期的挑战.
- 结构参数 (层间距离,金属-连接体距离) 和磁性顺序之间的关系尚未研究.
研究的目的:
- 在施加压力下研究石的磁结构相关性.
- 阐明结构变异对磁联接相互作用的作用.
- 构建一个压力-温度磁相图为jarosite.
主要方法:
- 单晶和粉末X射线衍射以研究压力下的结构变化.
- 基于SQUID的磁力测量,时间解析的同步子莫斯巴尔光谱学和X射线磁圆二极化以探测磁性.
- 用X射线发射光谱,莫斯巴尔光谱和紫外线可见吸收光谱绘制电子和磁性结构.
主要成果:
- 施加的压力改变了石中的层间距离和金属-连接体距离.
- 石的磁性排序温度随着压力显著增加,在40GPa时达到240K.
- 建立了磁结构相关性,解释了磁合相互作用的性质.
结论:
- 压力诱导的结构变化是了解石磁性行为的关键.
- 这项研究为石中的磁性排序提供了全面的解释.
- 这项工作提供了通过结构操纵控制磁性属性的见解.
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