论文标题
Cr $ _2 $ CO $ _ {（1-X）} $ CR $ _X $ al unterve Heusler Alloys的结构和磁性行为
Structural and magnetic behavior of Cr$_2$Co$_{(1-x)}$Cr$_x$Al inverse Heusler alloys
论文作者
论文摘要
我们报告了使用X射线衍射（XRD），Raman光谱，等化磁化化和磁性敏感性测量值。有趣的是，在这些反向助母结构中，XRD数据对XRD数据的rietveld细化XRD数据均显示出具有C/A比率约为1.38的四方变形。通过能量分散X射线光谱测量，已经证实了整体组成。在320〜cm $^{ - 1} $上观察到活动拉曼模式f $ _ {2g} $，它确认X型Heusler结构是A2和B2类型结构，已知不具有Raman活跃。 F $ _ {2G} $模式的面积随CR浓度而降低，这表明由于CO振动而导致该模式的起源。等温磁化数据在$ 70〜 $ 70〜KOE和可忽略不计的强制场上证实了接近零（$ \ le $ 0.02 $ 0.02 $μ_b/f.u. $）的磁矩，这表明这些样品具有完全补偿的铁磁性。敏感性行为表明零场和场冷却曲线与低温下的复杂磁相互作用之间的不可逆性。
We report the structural and magnetic behavior of single phase inverse Heusler alloys Cr$_2$Co$_{(1-x)}$Cr$_x$Al ($x = $ 0, 0.2, 0.4) using x-ray diffraction (XRD), Raman spectroscopy, isothermal magnetization, and magnetic susceptibility measurements. Interestingly, the Rietveld refinement of XRD data with the space group I$\bar{4}m2$ reveal a tetragonal distortion with c/a ratio around 1.38 in these inverse Heusler structures. The bulk compositions have been confirmed by energy dispersive x-ray spectroscopy measurements. The active Raman mode F$_{2g}$ is observed at 320~cm$^{-1}$, which confirms the X-type Heusler structure as the A2 and B2 type structures are known to be not Raman active. The area of F$_{2g}$ mode decreases with Cr concentration, which indicate the origin of this mode due to Co vibrations. The isothermal magnetization data confirm the magnetic moment close to zero ($\le$0.02 $μ_B/f.u.$) at $\approx$70~kOe and negligible coercive field suggest the fully compensated ferrimagnetic nature of these samples. The susceptibility behavior indicates irreversibility between zero-field and field-cooled curves and complex magnetic interactions at low temperatures.
