Two-dimensional superconductivity at a Mott insulator/band insulator interface LaTiO3/SrTiO3

J. Biscaras, N. Bergeal (), A. Kushwaha, T. Wolf, A. Rastogi, R.C. Budhani and J. Lesueur
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J. Biscaras: Laboratoire de Physique et d'Etude des Matériaux, UMR8213/CNRS, ESPCI ParisTech
N. Bergeal: Laboratoire de Physique et d'Etude des Matériaux, UMR8213/CNRS, ESPCI ParisTech
A. Kushwaha: Condensed Matter, Low Dimensional Systems Laboratory, Indian Institute of Technology Kanpur
T. Wolf: Laboratoire de Physique et d'Etude des Matériaux, UMR8213/CNRS, ESPCI ParisTech
A. Rastogi: Condensed Matter, Low Dimensional Systems Laboratory, Indian Institute of Technology Kanpur
R.C. Budhani: Condensed Matter, Low Dimensional Systems Laboratory, Indian Institute of Technology Kanpur
J. Lesueur: Laboratoire de Physique et d'Etude des Matériaux, UMR8213/CNRS, ESPCI ParisTech

Nature Communications, 2010, vol. 1, issue 1, 1-5

Abstract: Abstract Transition metal oxides show a great variety of quantum electronic behaviours where correlations often have an important role. The achievement of high-quality epitaxial interfaces involving such materials gives a unique opportunity to engineer artificial structures where new electronic orders take place. One of the most striking result in this area is the recent observation of a two-dimensional electron gas at the interface between a strongly correlated Mott insulator LaTiO3 and a band insulator SrTiO3. The mechanism responsible for such a behaviour is still under debate. In particular, the influence of the nature of the insulator has to be clarified. In this article, we show that despite the expected electronic correlations, LaTiO3/SrTiO3 heterostructures undergo a superconducting transition at a critical temperature Tconset~300 mK. We have found that the superconducting electron gas is confined over a typical thickness of 12 nm and is located mostly on the SrTiO3 substrate.

Date: 2010
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DOI: 10.1038/ncomms1084

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