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

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

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Article number6819
JournalScientific reports
Volume4
DOIs
StatePublished - Oct 29 2014

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polarity
oxides
thin films
high energy electrons
thick films
synchrotrons
x rays
electron diffraction
potential energy
insulators
electric fields
oxygen
cells
diffraction
metals
spectroscopy

All Science Journal Classification (ASJC) codes

  • General

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Middey, S. ; Rivero, P. ; Meyers, D. ; Kareev, M. ; Liu, X. ; Cao, Y. ; Freeland, J. W. ; Barraza-Lopez, S. ; Chakhalian, Jak. / Polarity compensation in ultra-thin films of complex oxides : The case of a perovskite nickelate. In: Scientific reports. 2014 ; Vol. 4.
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Middey, S, Rivero, P, Meyers, D, Kareev, M, Liu, X, Cao, Y, Freeland, JW, Barraza-Lopez, S & Chakhalian, J 2014, 'Polarity compensation in ultra-thin films of complex oxides: The case of a perovskite nickelate', Scientific reports, vol. 4, 6819. https://doi.org/10.1038/srep06819

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, Jak.

In: Scientific reports, Vol. 4, 6819, 29.10.2014.

Research output: Contribution to journalArticle

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AU - Middey, S.

AU - Rivero, P.

AU - Meyers, D.

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AU - Liu, X.

AU - Cao, Y.

AU - Freeland, J. W.

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AU - Chakhalian, Jak

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