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Using a first-principles method, we investigate the electronic structure and optical properties of rhombohedral LaNiO 3 . The total density of states shows that there is no band gap and bulk LaNiO 3 is metallic. There is a strong hybridization between Ni and O orbits near the Fermi level, suggesting that the metallic nature of LaNiO 3 mainly originates from Ni 3d states and...
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