在CoZr2H3.49的弱不变铁磁阶段的单轴负热膨胀
Yuto Watanabe1, Kota Suzuki2, Takayoshi Katase2,3
1Department of Physics, Tokyo Metropolitan University, 1-1 minami-Osawa, Hachioji, Tokyo 192-0397, Japan.
Journal of the American Chemical Society
|February 10, 2026
概括
化CoZr2H3.49在其铁磁阶段表现出单轴负热膨胀 (NTE). 这与非化超导体形成鲜明对比,表示气.
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
- 磁力学 磁力学 是一种
背景情况:
- 异常热膨胀现象,包括负热膨胀 (NTE),对材料科学有很大的兴趣.
- 磁性,电子结构和热膨胀之间的相互作用对于理解异国情调材料的特性至关重要.
- 之前对CoZr2超导体的研究强调了声子驱动的异常热膨胀.
研究的目的:
- 为了研究化合金 (CoZr2) 化合物的热膨胀行为.
- 探索 CoZr2H3.49.4 的铁磁阶段出现负热膨胀 (NTE) 的原因.
- 在这个系统中阐明漫游铁磁,电子结构和NTE之间的关系.
主要方法:
- 粉末同步射线X射线衍射被用来分析与温度的结构变化.
- 进行了磁化测量和阿罗特图分析以描述磁性特性.
- 罗德斯-沃尔法特比率被计算出来,以确定铁磁的流动性.
主要成果:
- 单轴负热膨胀 (NTE) 仅在低于基里温度 (139 K) 的CoZr2H3.49的弱移动铁磁相中观察到.
- 在加热时c轴收缩,而a轴显示正热膨胀.
- 罗德斯-沃尔法斯比值为3.49证实了铁磁运动的流动性.
结论:
- 在CoZr2中插入气显著改变电子结构和热膨胀机制,诱导单轴NTE.
- 观察到的NTE归因于抗结合Co3dz2状态的化,在铁磁状态下冷却时有利于c轴膨胀.
- CoZr2Hx系统是研究合超导,漫游铁磁和NTE的宝贵平台.
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