论文标题
在CR位置部分取代ISO-VALENT MO对Fe2Cral的电子结构和物理性能的影响
Effect of partial substitution of iso-valent Mo at Cr-site on electronic structure and physical properties of Fe2CrAl
论文作者
论文摘要
Heusler Alloy Fe2Cral在居里温度（TC）〜202 K以下表现出铁磁行为，以及在冰点温度（TF）〜3.9 K的存在（CG）相位〜3.9 K和300 K以上的GRIFFITHS相（GP）。在这里，我们研究了MO在CR位置部分取代对Fe2cral物理特性的影响。结构和形态分析证实了取代合金的单一立方结构。 MO浓度的增加将TC转移到较低的温度，这归因于Fe/Cr/mo的3D-4D状态之间杂交强度提高的影响。另外，对AC敏感性，磁记忆效应和时间依赖性磁化研究的系统分析证实了FE2CR0.95MO0.05AL中的CG样相位（TF）〜3.5 K。通过MO浓度升高，即在FE2CR0.85MO0.15AL中，该特征朝着较低的温度抑制。玻璃签名的起源归因于Mo浓度的磁各向异性的减少。随着MO取代的增加，在TC附近还发现了磁熵变化的部分增加。有趣的是，在高温下（350 K以上），由于存在抗部位疾病，GP相位均持续在两种合金中。
Heusler alloy Fe2CrAl exhibits a ferromagnetic behaviour below Curie temperature (TC) ~ 202 K along with presence of cluster glass (CG) phase near freezing temperature (Tf) ~ 3.9 K and Griffiths phase (GP) above 300 K. The physical properties of this alloy are very sensitive to substitutions and anti-site disorder. Here, we investigate the effect of partial substitution of Mo at Cr-site on physical properties of Fe2CrAl. Structural and morphological analysis confirms the single cubic structure of the substituted alloys. Increment in Mo concentration shifts the TC towards lower temperature, which is ascribed to the effect of increased hybridization strength between 3d-4d states of Fe/Cr/Mo. Additionally, systematic analysis of AC susceptibility, magnetic memory effect and time dependent magnetization studies confirm the presence of CG-like phase near (Tf) ~ 3.5 K in Fe2Cr0.95Mo0.05Al. Such feature gets suppressed towards lower temperature with an increase of Mo concentration, i.e. below 1.8 K in Fe2Cr0.85Mo0.15Al. The origin of the glassy signature is ascribed to the decrement in magnetic anisotropy with Mo concentration. A partial increment in magnetic entropy change is also noted near TC with the increase in Mo substitution. Interestingly, at high temperatures (above 350 K), GP phase persists in both the alloys due to the presence of anti-site disorder.
