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Surface sp half-metallicity of zinc-blende calcium monocarbide

机译:闪锌合碳化钙的表面sp半金属性

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摘要

Recent studies by Gao et al. [Phys. Rev. B 75, 174442 (2007)] indicate zinc-blende CaC, SrC, and BaC exhibit robust sp half-metallic ferromagnetism with Curie temperatures higher than room temperature. Here we further investigate the surface electronic and magnetic properties of CaC by using the first-principles full-potential linearized augmented plane-wave method. The (001) surfaces terminated with Ca and C, respectively, and the (110) surface terminated with both Ca and C are considered. We discuss the surface stabilities from the calculated relaxed surface energies. Electronic structure calculations indicate that the half-metallicity is destroyed for both the Ca- and C-terminated (001) surfaces; however, the (110) surface preserves the half-metallic characteristic of the bulk CaC. We further reveal that the atomic magnetic moments of the (001) surfaces are greatly different from the bulk values, but the difference of atomic magnetic moments between the (110) surface and the bulk CaC is very small.
机译:Gao等的最新研究。 [物理Rev. B 75,174442(2007)]表明,闪锌矿CaC,SrC和BaC表现出坚固的sp半金属铁磁性,居里温度高于室温。在这里,我们通过使用第一原理全势线性化增强平面波方法进一步研究CaC的表面电子和磁性。考虑分别以Ca和C终止的(001)表面和以Ca和C均终止的(110)表面。我们根据计算得出的松弛表面能讨论表面稳定性。电子结构计算表明,Ca和C端基(001)表面的半金属性均被破坏;但是,(110)表面保留了块状CaC的半金属特性。我们进一步揭示了(001)表面的原子磁矩与体积值有很大不同,但是(110)表面与体积CaC之间的原子磁矩的差异很小。

著录项

  • 来源
    《Journal of Applied Physics》 |2009年第5期|053703.1-053703.5|共5页
  • 作者

    G. Y. Gao; Kai-Lun Yao;

  • 作者单位

    School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China;

    School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China International Center of Materials.Chinese Academy of Sciences, Shenyang 110015, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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