Journal
SCIENCE
Volume 332, Issue 6032, Pages 937-940Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1202647
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Funding
- Deutsche Forschungsgemeinschaft [TRR80, C1]
- Schweizerische Nationalfonds [200020-129484]
- NCCR-MaNEP
- Swiss National Science Foundation (SNF) [200020_129484] Funding Source: Swiss National Science Foundation (SNF)
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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.
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