Orbital Engineering in Nickelate Heterostructures Driven by Anisotropic Oxygen Hybridization rather than Orbital Energy Levels

Fabbris, G.; Meyers, D.; Okamoto, J.; Pelliciari, J.; Disa, A. S.; Huang, Y.; Chen, Z. -Y.; Wu, W. B.; Chen, C. T.; Ismail-Beigi, S.; Ahn, C. H.; Walker, F. J.; Huang, D. J.; Schmitt, T.; Dean, M. P.  M.

doi:10.1103/PhysRevLett.117.147401

Title: Orbital Engineering in Nickelate Heterostructures Driven by Anisotropic Oxygen Hybridization rather than Orbital Energy Levels

Journal Article · Fri Sep 30 00:00:00 EDT 2016 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.117.147401· OSTI ID:1336148

Fabbris, G. ^[1]; Meyers, D. ^[1]; Okamoto, J. ^[2]; Pelliciari, J. ^[3]; Disa, A. S. ^[4]; Huang, Y. ^[3]; Chen, Z. -Y. ^[2]; Wu, W. B. ^[2]; Chen, C. T. ^[2]; Ismail-Beigi, S. ^[5]; Ahn, C. H. ^[5]; Walker, F. J. ^[4]; Huang, D. J. ^[6]; Schmitt, T. ^[3]; Dean, M. P. M. ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Condensed Matter Physics and Materials Science
National Synchrotron Radiation Research Center, Hsinchu (Taiwan)
Paul Scherrer Inst. (PSI), Villigen (Switzerland). Research Dept.
Yale Univ., New Haven, CT (United States). Dept. of Applied Physics
Yale Univ., New Haven, CT (United States). Dept. of Applied Physics and Dept. of Mechanical Engineering and Materials Science
National Synchrotron Radiation Research Center, Hsinchu (Taiwan); National Tsing Hua Univ., Hsinchu (Taiwan). Dept. of Physics

We used resonant inelastic x-ray scattering to investigate the electronic origin of orbital polarization in nickelate heterostructures taking LaTiO₃-LaNiO₃-3×(LaAlO₃), a system with exceptionally large polarization, as a model system. Furthermore, we find that heterostructuring generates only minor changes in the Ni 3d orbital energy levels, contradicting the often-invoked picture in which changes in orbital energy levels generate orbital polarization. Instead, O K-edge x-ray absorption spectroscopy demonstrates that orbital polarization is caused by an anisotropic reconstruction of the oxygen ligand hole states. This also provides an explanation for the limited success of theoretical predictions based on tuning orbital energy levels and implies that future theories should focus on anisotropic hybridization as the most effective means to drive large changes in electronic structure and realize novel emergent phenomena.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC00112704; 1047478

OSTI ID:: 1336148

Alternate ID(s):: OSTI ID: 1327546

Report Number(s):: BNL-112639-2016-JA; PRLTAO; R&D Project: PO011; KC0201060

Journal Information:: Physical Review Letters, Vol. 117, Issue 14; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 25 works

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Large orbital polarization in nickelate-cuprate heterostructures by dimensional control of oxygen coordination Liao, Zhaoliang; Skoropata, Elizabeth; Freeland, J. W. Nature Communications, Vol. 10, Issue 1 https://doi.org/10.1038/s41467-019-08472-y	journal	February 2019
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