Imaging the Real Space Structure of the Spin Fluctuations in an Iron-based superconductor
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.
Keywords
Cite
@article{arxiv.1703.07002,
title = {Imaging the Real Space Structure of the Spin Fluctuations in an Iron-based superconductor},
author = {Shun Chi and Ramakrishna Aluru and Stephanie Grothe and A. Kreisel and Udai Raj Singh and Brian M. Andersen and W. N. Hardy and Ruixing Liang and D. A. Bonn and S. A. Burke and Peter Wahl},
journal= {arXiv preprint arXiv:1703.07002},
year = {2017}
}
Comments
published version (7 pages, 5 figures)