Asymmetric orbital-lattice interactions in ultra-thin correlated oxide films

Details Asymmetric orbital-lattice interactions in ultra-thin correlated oxide films Asymmetric orbital-lattice interactions in ultra-thin correlated oxide films

2010-08-08

arxiv.org/abs/1008.1373v2

Phys. Rev. Lett. 107, 116805 (2011)

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevLett.107.116805

Using resonant X-ray spectroscopies combined with density functional calculations, we find an asymmetric bi-axial strain-induced $d$-orbital response in ultra-thin films of the correlated metal LaNiO$_3$ which are not accessible in the bulk. The sign of the misfit strain governs the stability of an octahedral "breathing" distortion, which, in turn, produces an emergent charge-ordered ground state with an altered ligand-hole density and bond covalency. Control of this new mechanism opens a pathway to rational orbital engineering, providing a platform for artificially designed Mott materials.

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