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Signatures of the electronic nature of pairing in high-Tc superconductors obtained by non-equilibrium boson spectroscopy

Author

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  • Vladimir M. Krasnov

    (AlbaNova University Center, Stockholm University)

  • Sven-Olof Katterwe

    (AlbaNova University Center, Stockholm University
    Present address: Institut für Luft- und Kältetechnik gemeinnützige Gesellschaft mbH, Bertolt-Brecht-Allee 20, D-01309 Dresden, Germany)

  • Andreas Rydh

    (AlbaNova University Center, Stockholm University)

Abstract

Understanding the pairing mechanism that gives rise to high-temperature superconductivity is one of the longest-standing problems of condensed-matter physics. Almost three decades after its discovery, even the question of whether or not phonons are involved remains a point of contention to some. Here we describe a technique for determining the spectra of bosons generated during the formation of Cooper pairs on recombination of hot electrons as they tunnel between the layers of a cuprate superconductor. The results obtained indicate that the bosons that mediate pairing decay over micrometre-scale distances and picosecond timescales, implying that they propagate at a speed of around 106 m s−1. This value is more than two orders of magnitude greater than the phonon propagation speed but close to Fermi velocity for electrons, suggesting that the pairing mechanism is mediated by unconventional repulsive electron–electron, rather than attractive electron–phonon, interactions.

Suggested Citation

  • Vladimir M. Krasnov & Sven-Olof Katterwe & Andreas Rydh, 2013. "Signatures of the electronic nature of pairing in high-Tc superconductors obtained by non-equilibrium boson spectroscopy," Nature Communications, Nature, vol. 4(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3970
    DOI: 10.1038/ncomms3970
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