The ordered tetragonal intermetallic ${\mathrm{Cr}}_2\mathrm{Al}$ forms the same structure type as ${\mathrm{Mn}}_2\mathrm{Au}$, and the latter has been heavily investigated for its potential in antiferromagnetic spintronics due to its degenerate in-plane Néel vector. We present the single-crystal flux growth of ${\mathrm{Cr}}_2\mathrm{Al}$ and orientation-dependent magnetic properties. Powder neutron diffraction of ${\mathrm{Cr}}_2\mathrm{Al}$ and first-principles simulations reveal that the magnetic ordering is likely in-plane and therefore identical to ${\mathrm{Mn}}_2\mathrm{Au}$, providing a second material candidate in the ${\mathrm{MoSi}}_2$ structure type to evaluate the fundamental interactions that govern spintronic effects. The single ordering transition seen in thermal analysis and resistivity indicates that canting of the moments along the $c$ axis is unlikely. Magnetometry, resistivity, and differential scanning calorimetry measurements confirm the Néel temperature to be $634\pm 2$ K. First-principles simulations indicate that the system has a small density of states at the Fermi energy and confirm the lowest-energy magnetic ground-state ordering, while Monte Carlo simulations match the experimental Néel temperature.

中文翻译：

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高温反铁磁体Cr2Al中的面内磁结构和交换相互作用

有序四方金属间化合物 ${铬}_2铝$ 形成相同的结构类型 ${锰}_2金$，后者因其退化的面内 Néel 矢量而在反铁磁自旋电子学中的潜力得到了大量研究。我们介绍了单晶助焊剂的生长${铬}_2铝$和取向相关的磁性。粉末中子衍射${铬}_2铝$ 和第一性原理模拟表明，磁排序可能在平面内，因此与 ${锰}_2金$，提供第二个候选材料 ${硅}_2$结构类型来评估控制自旋电子效应的基本相互作用。在热分析和电阻率中看到的单序转变表明力矩沿$C$轴不太可能。磁力测定法、电阻率和差示扫描量热法测量证实 Néel 温度为$634\pm 2$ K. 第一性原理模拟表明，该系统在费米能量下的态密度很小，并确认了最低能量的磁性基态排序，而蒙特卡罗模拟与实验 Néel 温度相匹配。