期刊
PHYSICAL REVIEW B
卷 80, 期 16, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.165412
关键词
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资金
- National Science Council of Taiwan [96-2628-M001-006-MY3]
- National Center for Theoretical Sciences (NCTS)
- National Center for High-Performance Computing (NCHC) in Taiwan
In this study, the 13-atom cluster structures of alkaline metals, alkaline-earth metals, boron group metals, carbon group metals, and 3d, 4d, and 5d transition metals in the periodic table are investigated by density functional theory with three kinds of exchange-correlation (XC) functionals: (i) local-density approximation (LDA); (ii) generalized gradient approximation (GGA) with Perdew-Wang 91; and (iii) generalized gradient approximation with Perdew-Burke-Ernzerhof. The dependence on pseudopotentials (PPs) with and without semicore electrons is also examined. The relative energies of five selected high-symmetry three-dimensional and four low-symmetry layer-type isomers for each element of interest are calculated and studied. Among the 44 metallic 13-atom clusters, our results show that the two GGA XC functionals have a great consistency; LDA and GGA results also reveal a great consistency, apart from the Cr, Mn, Fe, Co, Ni, and Rh 13-atom clusters, for which the results show a significant difference. Meanwhile, for most of the elements, the calculations with and without semicore PPs also produce consistent results, except for Cr, Mo, and V, which require a careful treatment of semicore states in the PPs.
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