Effect of Cr on the electronic structure of Co3Al intermetallic compound: A first-principles study

Effect of Cr on the electronic structure of Co3Al intermetallic compound: A first-principles study
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Cr对Co3Al金属间化合物电子结构的影响:第一性原理研究

DOI:
10.1016/j.jmmm.2007.11.006
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发表时间:
2008-04
影响因子:
2.7
通讯作者:
--
中科院分区:
材料科学3区
文献类型:
--
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用密度泛函方法研究了掺铬对Co3Al电子结构和磁性的影响。研究发现,在Co3Al中,铬原子对B位有很强的择优作用。随着Co的取代,总态密度(DOS)发生了明显的变化:在大多数自旋态的EF处出现了一个DOS峰,在少数自旋态上打开了能隙。在Co3Al中,铬的作用主要是将Co(A,C)原子的反键峰在能量尺度上推高,在EF附近形成能隙,并在EF处的大部分自旋方向上形成大的DOS峰。计算表明,Co和Cr自旋矩之间存在铁磁排列。计算的总磁矩随铬含量的增加而减小,并更接近斯莱特-鲍林曲线。这主要是由于Co(A,C)自旋矩的减小。同时,Co(B)和Cr(B)的力矩变化不大。
The effect of doping with Cr on the electronic structure and magnetism of Co3Al has been studied by density functional calculations. It has been found that the Cr atom has a strong site preference for the B-site in Co3Al. With the substitution of Cr for Co, the total densities of states (DOS) change obviously: A DOS peak appears at EFin the majority spin states and an energy gap is opened in the minority spin states. The effect of Cr in Co3Al is mainly to push the antibonding peak of the Co (A,C) atoms high on the energy scale and to form the energy gap around EF, and also to contribute to the large DOS peak at EFin the majority spin direction. The calculations indicate a ferromagnetic alignment between the Co and Cr spin moments. The calculated total magnetic moment decreases and becomes closer to the Slater–Pauling curve with increasing Cr content. This is mainly due to the decrease of the Co (A,C) spin moments. At the same time, the moments of Co (B) and Cr (B) only change slightly.
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