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Asymmetric Orbital-Lattice Interactions in Ultrathin Correlated Oxide Films
Journal article   Open access   Peer reviewed

Asymmetric Orbital-Lattice Interactions in Ultrathin Correlated Oxide Films

J. Chakhalian, J. M. Rondinelli, Jian Liu, B. A. Gray, M. Kareev, E. J. Moon, N. Prasai, J. L. Cohn, M. Varela, I. C. Tung, …
Physical review letters, v 107(11), pp 116805-116805
09 Sep 2011
PMID: 22026694
url
https://link.aps.org/accepted/10.1103/PhysRevLett.107.116805View
Published, Version of Record (VoR) Open

Abstract

Physical Sciences Physics Physics, Multidisciplinary Science & Technology
Using resonant x-ray spectroscopies combined with density functional calculations, we find an asymmetric biaxial strain-induced d-orbital response in ultrathin films of the correlated metal LaNiO3 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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Physics, Multidisciplinary
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