凝聚态物理
铁磁性
居里温度
旋转玻璃
材料科学
半金属
价(化学)
合金
磁化
磁矩
价电子
相(物质)
非晶态金属
化学
电子
自旋电子学
冶金
物理
磁场
量子力学
有机化学
作者
Sudip Chakraborty,Shuvankar Gupta,Chandan Mazumdar
标识
DOI:10.1016/j.jallcom.2023.173215
摘要
In this work, we report the synthesis of a Heusler alloy Rh2FeAl with valence electron count (VEC) 29 forming in B2-type structural disorder, where Fe atoms are distributed randomly with Al atoms between 4a and 4b Wyckoff positions (space group Fm3¯m, No: 225). Despite the structural disorder among the moment carrying Fe atoms, the compound exhibit ferromagnetic Curie temperature around TC ~ 497 K. Nevertheless, the observation of Griffiths-phase (GP) like behaviour at TG ~ 592 K suggests that atomic disorders brought down the bulk TC by about 95 K. The structural disorder also affects the ordered spin arrangements below TC through the development of a reentrant spin glass (RSG) state at low temperature. Both the GP like behaviour as well as RSG states are rarely observed in Heusler alloys while their coexistence is even rarer. The isothermal magnetisation as well as temperature dependence of resistivity behaviour ruled out the possibility of having half-metallic ferromagnetic characteristic in this material.
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