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The quasi-two-dimensional nature of ${\mathrm{LaNiO}}_{3}$ (LNO) thin films on ${\mathrm{SrTiO}}_{3}$(001) (STO) and ${\mathrm{LaAlO}}_{3}$(001) (LAO) substrates is examined. Although both samples undergo a metal-insulator transition with decreasing thickness, the spatial distributions of the insulating phase within the films differ from each other. The LNO cell volume of the insulating phase in LNO/STO is larger than that of the metallic phase, and the large cells remain at the interface in thick films with metallic conduction, suggesting a high oxygen-vacancy content at the interface. The cell volume of the insulating phase in LNO/LAO is smaller than that of the metallic phase, and the cell volume of the entire film changes coherently. The cell-volume decrease indicates that the bonding changes from bulklike to covalent.

physical review. b./physical review. b

Spatial coherence of the insulating phase in quasi-two-dimensional <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>LaNiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math> films

Spatial coherence of the insulating phase in quasi-two-dimensional LaNiO3 films