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

Author

Listed:
  • 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
    National Physical Laboratory)

  • J. Lesueur

    (Laboratoire de Physique et d'Etude des Matériaux, UMR8213/CNRS, ESPCI ParisTech)

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.

Suggested Citation

  • J. Biscaras & N. Bergeal & A. Kushwaha & T. Wolf & A. Rastogi & R.C. Budhani & J. Lesueur, 2010. "Two-dimensional superconductivity at a Mott insulator/band insulator interface LaTiO3/SrTiO3," Nature Communications, Nature, vol. 1(1), pages 1-5, December.
    • Handle: RePEc:nat:natcom:v:1:y:2010:i:1:d:10.1038_ncomms1084
    DOI: 10.1038/ncomms1084
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    Cited by:

    1. Shingo Kaneta-Takada & Miho Kitamura & Shoma Arai & Takuma Arai & Ryo Okano & Le Duc Anh & Tatsuro Endo & Koji Horiba & Hiroshi Kumigashira & Masaki Kobayashi & Munetoshi Seki & Hitoshi Tabata & Masaa, 2022. "Giant spin-to-charge conversion at an all-epitaxial single-crystal-oxide Rashba interface with a strongly correlated metal interlayer," Nature Communications, Nature, vol. 13(1), pages 1-8, December.

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