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Originally published in Science Express on 2 August 2007
Science 31 August 2007:
Vol. 317. no. 5842, pp. 1196 - 1199
DOI: 10.1126/science.1146006
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Reports

Superconducting Interfaces Between Insulating Oxides

N. Reyren,1 S. Thiel,2 A. D. Caviglia,1 L. Fitting Kourkoutis,3 G. Hammerl,2 C. Richter,2 C. W. Schneider,2 T. Kopp,2 A.-S. Rüetschi,1 D. Jaccard,1 M. Gabay,4 D. A. Muller,3 J.-M. Triscone,1 J. Mannhart2*

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, LaAlO3 and SrTiO3. 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 {cong} 200 millikelvin provides a strict upper limit to the thickness of the superconducting layer of {cong} 10 nanometers.

1 Département de Physique de la Matière Condensée, University of Geneva, 24 quai Ernest-Ansermet, 1211 Genève 4, Switzerland.
2 Experimental Physics VI, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany.
3 School of Applied and Engineering Physics, Cornell University, Ithaca, NY 14853, USA.
4 Laboratoire de Physique des Solides, Bat 510, Université Paris-Sud 11, Centre d'Orsay, 91405 Orsay, Cedex, France.

* To whom correspondence should be addressed. E-mail: jochen.mannhart{at}physik.uni-augsburg.de

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