Orbital reflectometry of PrNiO3/PrAlO3 superlattices

Wu, M.; Benckiser, E.; Audehm, P.; Goering, E.; Wochner, P.; Christiani, G.; Logvenov, G.; Habermeier, H.-U.; Keimer, B.

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Orbital reflectometry of PrNiO₃/PrAlO₃ superlattices

MPS-Authors

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

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Citation

Wu, M., Benckiser, E., Audehm, P., Goering, E., Wochner, P., Christiani, G., et al. (2015). Orbital reflectometry of PrNiO₃/PrAlO₃ superlattices. Physical Review B, 91(19): 195130.

Cite as: https://hdl.handle.net/21.11116/0000-000E-CAD4-F

Abstract

We present an x-ray orbital reflectometry and linear dichroism study of PrNiO3-PrAlO3 superlattices grown on substrates that induce either compressive or tensile strain. For superlattices under tensile strain, we observe a pronounced change of the local nickel electronic structure and a decrease of orbital polarization below the metal-insulator transition temperature, in qualitative agreement with theoretical scenarios for charge disproportionation. In contrast, the x-ray absorption spectra of the superlattice under compressive strain with suppressed metal-insulator transition show no temperature dependence at the magnetic transition, consistent with a spin density wave transition driven by epitaxial strain and spatial confinement of the conduction electrons. The layer-resolved orbital occupations indicate a linear orbital-strain coupling previously found in LaNiO3-based superlattices and suggest that, when present, the charge order encompasses the entire PrNiO3 layer stack.