Key Role of Hybridization between Actinide 5<i>f</i>and Oxygen 2<i>p</i>Orbitals for Electronic Structure of Actinide Dioxides

• 作者: Takahiro Maehira Takashi Hotta Yu Hasegawa
• 来源期刊: 现代物理(英文)
• 学科: 医学
• 关键词: TIGHT-BINDING Approximation Actinide DIOXIDES f-p HYBRIDIZATION Crystalline Electric Field Potential
• 年，卷（期）: 2013,（12）
• 页码范围: 1574-1582
• 页数: 9页
• 分类号: R73

摘要

In order to promote our understanding on electronic structure of actinide dioxides, we construct a tight-binding model composed of actinide 5f and oxygen 2p electrons, which is called f-p model. After the diagonalization of the f-p model, we compare the eigen-energies in the first Brillouin zone with the results of relativistic band-structure calculations. Here we emphasize a key role of f-p hybridization in order to understand the electronic structure of actinide dioxides. In particular, it is found that the position of energy levels of Г7 and Г8 states determined from crystalline electric field (CEF) potentials depends on the f-p hybridization. We investiagte the values of the Slater-Koster integrals for f-p hybridization, (fpσ) and (fpπ), which reproduce simultaneously the local CEF states and the band-structure calculation results. Then, we find that the absolute value of (fpπ) should be small in comparison with (fpσ) = 1 eV. The small value of |(fpπ)| is consistent with the condition to obtain the octupole ordering in the previous analysis of the f-p model.