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Density functional band calculations have been performed to studyLaNiO$_3$/LaAlO$_3$ superlattices. Motivated by recent experiments reportingthe magnetic and metal-insulator phase transition as a function of LaNiO$_3$layer thickness, we examined the electronic structure, magnetic properties, andorbital occupation depending on the number of LaNiO$_3$ layers. Calculationsshow that the magnetic phase is stabler than the nonmagnetic for finite andpositive $U$ values. The orbital polarization is significantly reduced by $U$even in the magnetic regions. The implications of the results are discussed incomparison to recent experimental and theoretical studies within thelimitations of the LDA$+U$ method.

Spin moment formation and reduced orbital polarization in LaNiO$_3$/LaAlO$_3$ superlattice: LDA+U study