Polarity-driven nickel oxide precipitation in LaNiO3-LaAlO3 superlattices

Detemple, E.; Ramasse, Q. M.; Sigle, W.; Cristiani, G.; Habermeier, H.-U.; Benckiser, E.; Boris, A. V.; Fraño, A.; Wochner, P.; Wu, M.; Keimer, B.; van Aken, P. A.

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Polarity-driven nickel oxide precipitation in LaNiO₃-LaAlO₃ superlattices

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Sigle, W.
Scientific Facility Stuttgart Center for Electron Microscopy (Peter A. van Aken), Max Planck Institute for Solid State Research, Max Planck Society;

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Cristiani, G.
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;

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Habermeier, H.-U.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Boris, A. V.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Wochner, P.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Keimer, B.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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van Aken, P. A.
Scientific Facility Stuttgart Center for Electron Microscopy (Peter A. van Aken), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Detemple, E., Ramasse, Q. M., Sigle, W., Cristiani, G., Habermeier, H.-U., Benckiser, E., et al. (2011). Polarity-driven nickel oxide precipitation in LaNiO₃-LaAlO₃ superlattices. Applied Physics Letters, 99(21): 211903.

Cite as: https://hdl.handle.net/21.11116/0000-000E-BE25-3

Abstract

We have studied the microstructure of LaNiO(3)-LaAlO(3) superlattices using transmission electron microscopy in combination with electron energy loss spectroscopy. In superlattices grown on non-polar SrTiO(3) substrates, nanometer-sized NiO precipitates form directly at the interface between the substrate and the initial LaNiO(3) layer, while control measurements on polar substrates show no NiO. Because of the drastically different electronic properties of NiO and LaNiO(3), such precipitates can strongly affect measurements on atomically thin LaNiO(3)-based films and multilayers on SrTiO(3). In general, polarity-driven secondary phase formation should be carefully evaluated as a possible consequence of the polarity mismatch at metal-oxide interfaces. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3663568]