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Superconductivity from repulsive electronic correlations on alternant cuprate and iron-based lattices

Authors

  • Lawrence J. Dunne,

    1. Department of Materials, Imperial College London, London, United Kingdom
    2. Department of Engineering Systems, London South Bank University, London, United Kingdom
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  • Erkki J. Brändas

    Corresponding author
    1. Department of Chemistry, Ångström Laboratory, University of Uppsala, Uppsala S-75120, Sweden
    • Department of Chemistry, Ångström Laboratory, University of Uppsala, Box 518, Uppsala S-75120, Sweden. E-mail: erkki.brandas@kemi.uu.se

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  • This article was published online on 23 March 2013. An error was subsequently identified. This notice is included in the online and print version to indicate that both have been corrected on 10 April 2013.

Abstract

A key question in the theory of high-temperature superconductivity is whether off-diagonal long-range order can be induced wholly or in large part by repulsive electronic correlations. Electron pairs on cuprate and the iron-based pnictide and chalcogenide alternant lattices may interact with a strong short-range Coulomb repulsion and much weaker longer range attractive tail. Here, we show that such interacting electrons can cooperate to produce a superconducting state in which time-reversed electron pairs effectively avoid the repulsive part but reside predominantly in the attractive region of the potential. The alternant lattice structure is a key feature of such a stabilization mechanism leading to the occurrence of high-temperature superconductivity with inline image or sign alternating s-wave or s± condensate symmetries. © 2013 Wiley Periodicals, Inc.

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