Boris, A. V. Matiks, Y. Benckiser, E. Frano, A. Popovich, P. Hinkov, V. Wochner, P. Castro-Colin, M. Detemple, E. Malik, Vivek Kumar Bernhard, Christian Prokscha, T. Suter, A. Salman, Z. Morenzoni, E. Cristiani, G. Habermeier, H.-U. Keimer, B. 2011-05-20 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 (LaNiO₃) and the wide-gap insulator lanthanum aluminate (LaAlO₃) with atomically precise layer sequences. We used optical ellipsometry and low-energy muon spin rotation to show that superlattices with LaNiO₃ 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 LaNiO₃ 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. application/pdf https://folia.unifr.ch/global/documents/301969 https://folia.unifr.ch/documents/301969/files/ber_dce.pdf https://folia.unifr.ch/documents/301969/files/ber_dce_sm.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1126/science.1202647 info:eu-repo/semantics/openAccess License undefined Science. - 2011, vol. 332, no. 6032, p. 937-940 info:eu-repo/classification/udc/53 Dimensionality control of electronic phase transitions in nickel-Oxide superlattices http://purl.org/coar/resource_type/c_6501