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American Association for the Advancement of Science, Science, 5842(317), p. 1196-1199, 2007

DOI: 10.1126/science.1146006

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Superconducting interfaces between insulating oxides

Journal article published in 2007 by N. Reyren ORCID, S. Thiel, Caviglia Ad, A. D. Caviglia, L. Fitting Kourkoutis, L. F. Kourkoutis, G. Hammerl, C. Richter ORCID, C. W. Schneider ORCID, T. Kopp, A.-S. Rüetschi, D. Jaccard, M. Gabay, D. A. Muller ORCID, J.-M. Triscone and other authors.
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This paper is available in a repository.

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Abstract

At interfaces between complex oxides, electronic systems with unusual electronic properties can be generated. We report on superconductivity in the electron gas formed at the interface between two insulating dielectric perovskite oxides, LaAlO 3 and SrTiO 3 . The behavior of the electron gas is that of a two-dimensional superconductor, confined to a thin sheet at the interface. The superconducting transition temperature of ≅ 200 millikelvin provides a strict upper limit to the thickness of the superconducting layer of ≅ 10 nanometers.