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Revisiting the vortex-core tunnelling spectroscopy in YBa2Cu3O7−δ

Author

Listed:
  • Jens Bruér

    (University of Geneva)

  • Ivan Maggio-Aprile

    (University of Geneva)

  • Nathan Jenkins

    (University of Geneva)

  • Zoran Ristić

    (University of Geneva)

  • Andreas Erb

    (Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften)

  • Christophe Berthod

    (University of Geneva)

  • Øystein Fischer

    (University of Geneva)

  • Christoph Renner

    (University of Geneva)

Abstract

The observation by scanning tunnelling spectroscopy of Abrikosov vortex cores in the high-temperature superconductor YBa2Cu3O7−δ (Y123) has revealed a robust pair of electron-hole symmetric states at finite subgap energy. Their interpretation remains an open question because theory predicts a different signature in the vortex cores, characterized by a strong zero-bias conductance peak. Here, we present scanning tunnelling spectroscopy data on very homogeneous Y123 at 0.4 K revealing that the subgap features do not belong to vortices: they are actually observed everywhere along the surface with high spatial and energy reproducibility, even in the absence of magnetic field. Detailed analysis and modelling show that these states remain unpaired in the superconducting phase and belong to an incoherent channel, which contributes to the tunnelling signal in parallel with the superconducting density of states.

Suggested Citation

  • Jens Bruér & Ivan Maggio-Aprile & Nathan Jenkins & Zoran Ristić & Andreas Erb & Christophe Berthod & Øystein Fischer & Christoph Renner, 2016. "Revisiting the vortex-core tunnelling spectroscopy in YBa2Cu3O7−δ," Nature Communications, Nature, vol. 7(1), pages 1-6, September.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11139
    DOI: 10.1038/ncomms11139
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