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

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 and Peter Wahl ()
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Shun Chi: University of British Columbia
Ramakrishna Aluru: SUPA, School of Physics and Astronomy, University of St Andrews
Stephanie Grothe: University of British Columbia
A. Kreisel: Niels Bohr Institute, University of Copenhagen
Udai Raj Singh: Max-Planck-Institut für Festkörperforschung
Brian M. Andersen: Niels Bohr Institute, University of Copenhagen
W. N. Hardy: University of British Columbia
Ruixing Liang: University of British Columbia
D. A. Bonn: University of British Columbia
S. A. Burke: University of British Columbia
Peter Wahl: SUPA, School of Physics and Astronomy, University of St Andrews

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: 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.

Date: 2017
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DOI: 10.1038/ncomms15996

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