Effect of Cr on the electronic structure of Co 3 Al intermetallic compound: A first-principles study

Hongzhi Luo, Zhiyong Zhu, Li Ma, Shifeng Xu, Guangheng Wu*, Heyan Liu, Jingping Qu, Yangxian Li, Xiaoxi Zhu, Chengbao Jiang, Huibin Xu

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    12 Scopus citations

    Abstract

    The effect of doping with Cr on the electronic structure and magnetism of Co 3 Al 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 Co 3 Al. With the substitution of Cr for Co, the total densities of states (DOS) change obviously: A DOS peak appears at E F in the majority spin states and an energy gap is opened in the minority spin states. The effect of Cr in Co 3 Al 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 E F , and also to contribute to the large DOS peak at E F in 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.

    Original languageEnglish (US)
    Pages (from-to)1345-1351
    Number of pages7
    JournalJournal of Magnetism and Magnetic Materials
    Volume320
    Issue number7
    DOIs
    StatePublished - Apr 1 2008

    Keywords

    • Band structure
    • Half-metallicity
    • Heusler alloy

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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