Dimensionality Control of Electronic Phase Transitions in Nickel-Oxide 
Superlattices

Boris, A. V.; Matiks, Y.; Benckiser, E.; Fraño, A.; Popovich, P.; Hinkov, V.; Wochner, P.; Castro-Colin, M.; Detemple, E.; Malik, V. K.; Bernhard, C.; Prokscha, T.; Suter, A.; Salman, Z.; Morenzoni, E.; Cristiani, G.; Habermeier, H.-U.; Keimer, B.

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Dimensionality Control of Electronic Phase Transitions in Nickel-Oxide Superlattices

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

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Citation

Boris, A. V., Matiks, Y., Benckiser, E., Fraño, A., Popovich, P., Hinkov, V., et al. (2011). Dimensionality Control of Electronic Phase Transitions in Nickel-Oxide Superlattices. Science, 332(6032), 937-940.

Cite as: https://hdl.handle.net/21.11116/0000-000E-C147-8

Abstract

The competition between collective quantum phases in materials with strongly correlated electrons depends sensitively on the dimensionality of the electron system, which is difficult to control by standard solid-state chemistry. We have fabricated superlattices of the paramagnetic metal lanthanum nickelate (LaNiO(3)) and the wide-gap insulator lanthanum aluminate (LaAlO(3)) with atomically precise layer sequences. We used optical ellipsometry and low-energy muon spin rotation to show that superlattices with LaNiO(3) as thin as two unit cells undergo a sequence of collective metal-insulator and antiferromagnetic transitions as a function of decreasing temperature, whereas samples with thicker LaNiO(3) layers remain metallic and paramagnetic at all temperatures. Metal-oxide superlattices thus allow control of the dimensionality and collective phase behavior of correlated-electron systems.