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arXiv 2009.09157cond-mat.mtrl-sci
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采用第一性原理计算方法,利用LDA、PBE-GGA和WC-GGA泛函,研究了Ce3 +基钙钛矿CeTmO3 [ Tm3 + = Sc,Ti,V]的晶体、磁性和电子结构的主要物理特性

Main physical characteristics of crystal, magnetic and electronic structures of Ce3+-based perovskites CeTmO3 [Tm3+ = Sc, Ti, V] investigated via the first-principles computational utilizing LDA, PBE-GGA and WC-GGA functionals

M. Musa Saad H. -E

摘要:

采用第一性原理计算方法,系统研究了铈基钙钛矿CeTmO 3 [Tm 3 + = Sc,Ti,V]的主要物理性质、晶体结构、磁性和电子结构.基于密度泛函理论,在Perdew-Burke-Ernzerh和Wu-Cohen的局域密度近似和广义梯度近似下,得到了全势线性缀加平面波。优化后的晶体参数表明,化合物的晶体属立方结构(空间群Pm-3 m,no.221),晶格常数与实验值吻合较好。计算的电子能带结构、态密度和电荷密度揭示了CeTmO 3的金属性质,除了[Tm 3 + = Sc]外,CeTmO 3表现出半金属特性。此外,所有的泛函提供了几乎相似的晶体结构的结果,DOS以及自旋磁矩确认CeTmO 3是铁磁(FM)金属。

英文摘要:

Main physical characteristics, crystal, magnetic and electronic structures, of cerium-based perovskites CeTmO3 [Tm3+ = Sc, Ti, V] are systematically investigated via the first-principles computations. Full-potential linear augmented plane-wave with the local density approximation and generalized gradient approximation, under Perdew-Burke-Ernzerh and Wu-Cohen, based on DFT. The optimized crystal parameters indicate that the crystal of compounds can categorized under cubic structure (space group Pm-3m, no. 221), and their obtained lattice constants in good agreement with the available experimental values. The computed electronic band structures, density of states (DOS) and charge density reveal the metallic nature for CeTmO3, except for [Tm3+ = Sc], exhibits half-metallic characteristics. Besides, all functionals provide nearly similar results of crystal structures, DOSs as well as spin magnetic moments confirm that the CeTmO3 are ferromagnetic (FM) metals.

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