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

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arxiv 1008.1373 v2 pith:RJUHLL5V submitted 2010-08-08 cond-mat.mtrl-sci cond-mat.str-el

J. Chakhalian , J.M. Rondinelli , Jian Liu , B.A. Gray , M. Kareev , E.J. Moon , N. Prasai , J.L. Cohn
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M. Varela I.C. Tung M.J. Bedzyk S.G. Altendorf F. Strigari B. Dabrowski L.H. Tjeng P.J. Ryan J.W. Freeland
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classification cond-mat.mtrl-scicond-mat.str-el
keywords asymmetriccorrelateddensityfilmsorbitalultra-thinaccessiblealtered
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abstract

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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