Electronic and magnetic properties of the NdNiO${}_2$/SrTiO${}_3$ thin films

Abstract

The hole-doped NdNiO${}_2$ layer deposited on the SrTiO${}_3$ surface exhibits unconventional superconductivity. Here, we present a systematic study of the electronic and magnetic properties of the NdNiO${}_2$ superconductor using the density functional theory (DFT). The strong local Coulomb interactions in the Ni($3d)$ and Nd($4f$) states are included within the DFT+$U$ method. The effect of Sr doping on the electronic band structure and density of states was studied for the NdNiO${}_2$ thin films deposited on the SrTiO${}_3$ (001) surface. The results obtained for the uncapped thin films were compared with the calculations for the NdNiO${}_2$ films capped by the SrTiO${}_3$ layer. We have found significant changes in the electronic structure and magnetic properties of the thin films compared to the bulk crystal.

9 pages, 4 figures