Impact of Iron-site defects on Superconductivity in LiFeAs

Abstract

In conventional s-wave superconductors, only magnetic impurities exhibit impurity bound states, whereas for an s+- order parameter they can occur for both magnetic and non-magnetic impurities. Impurity bound states in superconductors can thus provide important insight into the order parameter. Here, we present a combined experimental and theoretical study of native and engineered iron-site defects in LiFeAs. Detailed comparison of tunneling spectra measured on impurities with spin fluctuation theory reveals a continuous evolution from negligible impurity bound state features for weaker scattering potential to clearly detectable states for somewhat stronger scattering potentials. All bound states for these intermediate strength potentials are pinned at or close to the gap edge of the smaller gap, a phenomenon that we explain and ascribe to multi-orbital physics.

arXiv comment5 pages, 4 figures

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• Imaging the Real Space Structure of the Spin Fluctuations in an Iron-based superconductor
• Universality of scanning tunneling microscopy in cuprate superconductors
• Towards a quantitative description of tunneling conductance of superconductors: application to LiFeAs
• Quantum phase transition of correlated iron-based superconductivity in LiFe${}_{1-x}$Co${}_x$As
• Theoretical study of impurity-induced magnetism in FeSe
• Impurity-induced bound states inside the superconducting gap of FeSe
• Visualization of local magnetic moments emerging from impurities in the Hund's metal states of FeSe
• Direct visualization of phase separation between superconducting and nematic domains in Co-doped CaFe2As2 close to a first order phase transition
• Electronic Theory for Scanning Tunneling Microscopy Spectra in Infinite-Layer Nickelate Superconductors
• Detecting sign-changing superconducting gap in LiFeAs using quasiparticle interference
• Local signatures of altermagnetism
• The study of intrinsic defect state of FeSe with scanning tunneling microscopy