Electronic structure and orbital polarization of LaNiO$_3$ with a reduced coordination and under strain: first-principles study

Details Electronic structure and orbital polarization of LaNiO$_3$ with a reduced coordination and under strain: first-principles study Electronic structure and orbital polarization of LaNiO$_3$ with a reduced coordination and under strain: first-principles study

2011-05-26

arxiv.org/abs/1105.5407v2

Phys. Rev. B 84, 125137 (2011)

Physics

Condensed Matter

Materials Science

Phys. Rev. B (in press)

Scientific paper

10.1103/PhysRevB.84.125137

First-principles density functional theory calculations have been performed to understand the electronic structure and orbital polarization of LaNiO$_3$ 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.

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