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arXiv 1209.6247cond-mat.mtrl-sci
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筛选的杂化泛函在过渡金属Rh、Pd和Pt体材料中的应用

Application of screened hybrid functionals to the bulk transition metals Rh, Pd, and Pt

Fabien Tran, David Koller, Peter Blaha

摘要:

我们提出了使用筛选的杂化功能YS-PBE 0 [F. Tran和P. Blaha,Phys. Rev. \textbf{83},235118(2011)]。平衡几何的结果进行了比较,从(半)局部泛函,即局部密度近似和广义梯度近似PBE Perdew \textit{et al}。[J. P. Perdew,K.伯克,和M。恩泽霍夫,《物理评论快报》\textbf{77},3865(1996)]。结果表明,筛选的混合功能产生更准确的平衡几何比PBE,但总的来说,它不是更准确的LDA。然而,在矛盾的实验,我们发现,屏蔽的混合功能有利于铁磁态作为基态的所有三种过渡金属。因此,混合泛函的使用,例如,在金属载体上具有相关氧化物的催化活性体系的研究是有问题的。

英文摘要:

We present the results of calculations on bulk transition metals Rh, Pd, and Pt using the screened hybrid functional YS-PBE0 [F. Tran and P. Blaha, Phys. Rev. B \textbf{83}, 235118 (2011)]. The results for the equilibrium geometry are compared with those obtained from (semi)local functionals, namely, the local density approximation and the generalized gradient approximation PBE of Perdew \textit{et al}. [J. P. Perdew, K. Burke, and M. Ernzerhof, Phys. Rev. Lett. \textbf{77}, 3865 (1996)]. It is shown that the screened hybrid functional yields more accurate equilibrium geometry than PBE, but, overall, it is not more accurate than LDA. However, in contradiction with experiment, we find that the screened hybrid functional favors a ferromagnetic state as the ground state for all three transition metals. Therefore, the use of hybrid functionals for, e.g., the study of catalytically active systems with correlated oxides on a metal support is questionable.

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