Electronic structure and orbital polarization of LaNiO3with a reduced coordination and under strain: A first-principles study

Abstract

First-principles density functional theory calculations have been performed to understand the electronic structure and orbital polarization of LaNiO3 with a reduced coordination and under strain. From the slab calculation to simulate [001] surface, it is found that d 3z 2 −r 2 orbital occupation is significantly enhanced relative to d x 2 −y 2 occupation owing to the reduced coordination along the perpendicular direction to the sample plane. Furthermore, the sign of the orbital polarization does not change under external strain. The results are discussed in comparison to the bulk and heterostructure cases, which sheds new light on the understanding of the available experimental data.

Spin-moment formation and reduced orbital polarization in LaNiO3/LaAlO3superlattice:LDA+UHan1, Veenendaal2 2012Phys. Rev. BSelf Cite224182View full textAdd to dashboardCite

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