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Imaging the real space structure of the spin fluctuations in an iron-based superconductor

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  • Shun Chi

    (University of British Columbia
    Stewart Blusson Quantum Matter Institute, University of British Columbia)

  • Ramakrishna Aluru

    (SUPA, School of Physics and Astronomy, University of St Andrews
    Max-Planck-Institut für Festkörperforschung)

  • Stephanie Grothe

    (University of British Columbia
    Stewart Blusson Quantum Matter Institute, University of British Columbia)

  • A. Kreisel

    (Niels Bohr Institute, University of Copenhagen
    Institut für Theoretische Physik, Universität Leipzig)

  • Udai Raj Singh

    (Max-Planck-Institut für Festkörperforschung)

  • Brian M. Andersen

    (Niels Bohr Institute, University of Copenhagen)

  • W. N. Hardy

    (University of British Columbia
    Stewart Blusson Quantum Matter Institute, University of British Columbia)

  • Ruixing Liang

    (University of British Columbia
    Stewart Blusson Quantum Matter Institute, University of British Columbia)

  • D. A. Bonn

    (University of British Columbia
    Stewart Blusson Quantum Matter Institute, University of British Columbia)

  • S. A. Burke

    (University of British Columbia
    Stewart Blusson Quantum Matter Institute, University of British Columbia
    University of British Columbia)

  • Peter Wahl

    (SUPA, School of Physics and Astronomy, University of St Andrews
    Max-Planck-Institut für Festkörperforschung)

Abstract

Spin fluctuations are a leading candidate for the pairing mechanism in high temperature superconductors, supported by the common appearance of a distinct resonance in the spin susceptibility across the cuprates, iron-based superconductors and many heavy fermion materials. The information we have about the spin resonance comes almost exclusively from neutron scattering. Here we demonstrate that by using low-temperature scanning tunnelling microscopy and spectroscopy we can characterize the spin resonance in real space. We show that inelastic tunnelling leads to the characteristic dip-hump feature seen in tunnelling spectra in high temperature superconductors and that this feature arises from excitations of the spin fluctuations. Spatial mapping of this feature near defects allows us to probe non-local properties of the spin susceptibility and to image its real space structure.

Suggested Citation

  • Shun Chi & Ramakrishna Aluru & Stephanie Grothe & A. Kreisel & Udai Raj Singh & Brian M. Andersen & W. N. Hardy & Ruixing Liang & D. A. Bonn & S. A. Burke & Peter Wahl, 2017. "Imaging the real space structure of the spin fluctuations in an iron-based superconductor," Nature Communications, Nature, vol. 8(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms15996
    DOI: 10.1038/ncomms15996
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