在FeTi2S4中阐明磁弹性合,压力依赖的磁性行为和异常的霍尔效应
Romualdo S Silva1, João E Rodrigues2, Angelika D Rosa2
1Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, E-28049 Madrid, Spain.
ACS applied materials & interfaces
|October 20, 2023
概括
这项研究研究了 (Fe,Ti) 基硫化物,揭示了磁弹性合和压力敏感的抗铁磁过渡. 这些发现为先进的电子和磁性应用提供了对分层材料的见解.
科学领域:
- 材料物理 材料物理
- 固态化学 固态化学
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- 过渡金属化物具有间接的分层结构,表现出有趣的电子和磁性特性.
- 这些材料在磁性制冷,催化和热电学方面具有潜在的应用.
研究的目的:
- 综合调查基于 (Fe,Ti) 的硫化物 (FexTi2S4) 的结构,电子和磁性特性.
- 探索局部结构,磁性过渡和磁弹性合之间的关系.
- 了解压力和构成对磁性排序和传输特性的影响.
主要方法:
- 在高压条件下合成聚晶 (Fe,Ti) 基硫化物.
- 使用同步龙X射线衍射进行结构性表征.
- 通过Fe K边缘扩展X射线吸收细结构 (EXAFS) 进行局部结构和振动分析.
- 磁性测量包括磁热度计,压力磁度计,磁电阻 (MR) 和霍尔效应.
主要成果:
- 证实了多层海底石类型的晶体结构.
- 在磁过渡附近通过Fe-S键收缩观察到磁弹性合的证据.
- 从EXAFS中确定Fe-S和Fe-Ti键的爱因斯坦温度 (θE).
- 在Fe0.42Ti2S4中观察到大约120K的抗铁磁排序,过渡温度对压力和组成敏感.
- 在2K以下识别的超磁性过渡,导致确定贝里曲率解参数 (SH = 0.12 V-1).
- 强烈的不弹性散射对异常的霍尔效应 (AHE) 的贡献与高温集群旋转玻璃相相关.
结论:
- 这项研究阐明了 (Fe,Ti) 基硫化物中结构,磁性和电子性质之间的复杂相互作用.
- 磁弹性效应显著影响这些层级材料的磁性行为.
- 观察到的磁过渡的压力和组成依赖性突出显示了它们对潜在应用的可调性.
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