Polarity compensation in ultra-thin films of complex oxides: The case of a perovskite nickelate

Middey, S.; Rivero, P.; Meyers, D.; Kareev, M.; Liu, X.; Cao, Y.; Freeland, J. W.; Barraza-Lopez, S.; Chakhalian, J.

doi:10.1038/srep06819

Title: Polarity compensation in ultra-thin films of complex oxides: The case of a perovskite nickelate

Journal Article · Wed Oct 29 00:00:00 EDT 2014 · Scientific Reports

DOI:https://doi.org/10.1038/srep06819· OSTI ID:1221158

Middey, S. ^[1]; Rivero, P. ^[1]; Meyers, D. ^[1]; Kareev, M. ^[1]; Liu, X. ^[1]; Cao, Y. ^[1]; Freeland, J. W. ^[2]; Barraza-Lopez, S. ^[1]; Chakhalian, J. ^[1]

University of Arkansas, Fayetteville, AR (United States). Dept. of Physics.
Argonne National Lab. (ANL), Argonne, IL (United States)

In this study, we address the fundamental issue of growth of perovskite ultra-thin films under the condition of a strong polar mismatch at the heterointerface exemplified by the growth of a correlated metal LaNiO₃ on the band insulator SrTiO₃ along the pseudo cubic [111] direction. While in general the metallic LaNiO₃ film can effectively screen this polarity mismatch, we establish that in the ultra-thin limit, films are insulating in nature and require additional chemical and structural reconstruction to compensate for such mismatch. A combination of in-situ reflection high-energy electron diffraction recorded during the growth, X-ray diffraction, and synchrotron based resonant X-ray spectroscopy reveal the formation of a chemical phase La₂Ni₂O₅ (Ni²⁺) for a few unit-cell thick films. First-principles layer-resolved calculations of the potential energy across the nominal LaNiO₃/SrTiO₃ interface confirm that the oxygen vacancies can efficiently reduce the electric field at the interface.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

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

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1221158

Alternate ID(s):: OSTI ID: 1241336

Journal Information:: Scientific Reports, Vol. 4; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 47 works

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Title: Polarity compensation in ultra-thin films of complex oxides: The case of a perovskite nickelate

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