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arXiv 1104.3598cond-mat.mtrl-sci
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优化的正交基紧约束。应用于铁

Optimized Orthogonal Basis Tight Binding. Application to Iron

Georg K. H. Madsen, Eunan J. McEniry, Ralf Drautz

摘要:

利用密度泛函理论中原子轨道线性组合方法与Slater Koster双中心紧束缚模型之间的形式联系,导出了铁原子的正交$d$带紧束缚模型,该模型只需要两个拟合参数.由此产生的紧束缚模型正确地预测了低能铁相的能量有序性,包括铁磁BCC,反铁磁FCC,HCP和拓扑密堆积结构。未包括在拟合中的测试结构的能量学与包括的能量学一样好地再现,从而证明了模型的可转移性。简单模型也给出了一个很好的描述的空位形成能在铁磁的BCC和FCC铁晶格。

英文摘要:

The formal link between the linear combination of atomic orbitals approach to density functional theory and two-center Slater-Koster tight-binding models is used to derive an orthogonal $d$-band tight-binding model for iron with only two fitting parameters. The resulting tight-binding model correctly predicts the energetic ordering of the low energy iron-phases, including the ferromagnetic BCC, antiferromagnetic FCC, HCP and topologically close-packed structures. The energetics of test structures that were not included in the fit are equally well reproduced as those included, thus demonstrating the transferability of the model. The simple model also gives a good description of the vacancy formation energy in the nonmagnetic FCC and ferromagnetic BCC iron lattices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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