Critical Behavior of the Magnetization in Heusler Alloy Co2TiGa0.8Sn0.2
Critical Behavior of the Magnetization in Heusler Alloy Co2TiGa0.8Sn0.2
复制标题
Heusler合金Co2TiGa0.8Sn0.2磁化的临界行为
DOI：
10.1109/tmag.2021.3097164
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发表时间：
2021
影响因子：
2.1
通讯作者：
Masahiko Hiroi
中科院分区：
文献类型：
--
作者：
Takaaki Yokoyama;Iduru Shigeta;Akiko Nomura;Kunio Yubuta;Touru Yamauchi;Rie Y. Umetsu;Hironori Nishihara;Takeshi Kanomata;Masahiko Hiroi
本文报道了Heusler合金Co2TiGa0.8Sn0.2的临界磁化行为，Co2TiGa0.8Sn0.2是一种具有拓扑Weyl费米子特性的高自旋极化材料.外尔半金属材料由于其独特的磁电子和磁热性质，在自旋电子学器件的应用中具有重要的意义。研究了合成的Heusler合金Co2TiGa0.8Sn0.2在居里温度附近的磁性。Co2TiGa0.8Sn0.2的磁性等温线测量表明，在最大外加磁场为50 kOe的高磁场下，临界指数为4.455（4），在最大外加磁场为10 kOe的低磁场下，临界指数为4.823（9）。这两个值都不同于传统的分子场理论所给出的3.0，而接近于巡游电子铁磁体自旋涨落理论所预言的5.0。实验结果与理论模型之间的差异可能的起源进行了讨论。
We report the critical behavior of the magnetization in Heusler alloy Co2TiGa0.8Sn0.2as a potential candidate of high spin-polarized materials with the characteristics of topological Weyl fermions. The Weyl semimetals are materials of great interest for applying spintronics devices, due to their unusual magnetoelectronic and magnetothermal properties. The magnetic properties of the synthesized Heusler alloy Co2TiGa0.8Sn0.2are investigated around the Curie temperature. The magnetic isotherm measurements of Co2TiGa0.8Sn0.2aroundexhibit that the critical exponentis deduced to be 4.455(4) in high maximum applied field of 50 kOe and 4.823(9) in low maximum applied field of 10 kOe, respectively. Bothvalues are different from 3.0 derived by the conventional molecular field theory, but they are close to 5.0 predicted by the spin fluctuation theory for the itinerant electron ferromagnets. Possible origins for the discrepancy between experimental results and theoretical models are also discussed.