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The competition between collective quantum phases in materials with stronglycorrelated electrons depends sensitively on the dimensionality of the electronsystem, which is difficult to control by standard solid-state chemistry. Wehave fabricated superlattices of the paramagnetic metal LaNiO3 and the wide-gapinsulator LaAlO3 with atomically precise layer sequences. Using opticalellipsometry and low-energy muon spin rotation, superlattices with LaNiO3 asthin as two unit cells are shown to undergo a sequence of collectivemetalinsulator and antiferromagnetic transitions as a function of decreasingtemperature, whereas samples with thicker LaNiO3 layers remain metallic andparamagnetic at all temperatures. Metal-oxide superlattices thus allow controlof the dimensionality and collective phase behavior of correlated-electronsystems.

Dimensionality Control of Electronic Phase Transitions in Nickel-Oxide Superlattices