Decoupled Pairing Amplitude and Electronic Coherence in Iron-Based Superconductors

Abstract

Here we use angle-resolved photoemission spectroscopy to study superconductivity that emerges in two extreme cases, from a Fermi liquid phase (LiFeAs) and an incoherent bad-metal phase (FeTe0.55Se0.45). We find that although the electronic coherence can strongly reshape the single-particle spectral function in the superconducting state, it is decoupled from the maximum superconducting pairing amplitude, which shows a universal scaling that is valid for all FeSCs. Our observation excludes pairing scenarios in the BCS and the BEC limit for FeSCs and calls for a universal strong coupling pairing mechanism for the FeSCs.

arXiv comment6 pages, 4 figures

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• Hund's metal physics: from SrNiO${}_2$ to NdNiO${}_2$
• A new Majorana platform in an Fe-As bilayer superconductor
• Hidden order and beyond: an experimental-theoretical overview of the multifaceted behavior of URu${}_2$Si${}_2$
• A strongly inhomogeneous superfluid in an iron-based superconductor
• Pairing Mechanism in Hunds Metal Superconductors and the Universality of the Superconducting Gap to Critical Temperature Ratio
• Orbital selectivity in electron correlations and superconducting pairing of iron-based superconductors
• Spatially dispersing Yu-Shiba-Rusinov states in the unconventional superconductor ${\mathrm{FeTe}}_{0.55}{\mathrm{Se}}_{0.45}$
• Orbital Selective Mott Transition Effects and Non-Trivial Topology of Iron Chalcogenide
• Emergent superconducting fluctuations in a compressed kagome superconductor
• On the Spatial Locality of Electronic Correlations in LiFeAs
• Anomalous Shiba states in topological iron-based superconductors
• Unusual band splitting and superconducting gap evolution with sulfur substitution in FeSe
• The Hund's Superconductor Li(Fe,Co)As
• Anomalous Shiba spectrum and superconductivity induced magnetic interactions in materials with topological band inversion
• Triplet pairing, orbital selectivity and correlations in Iron-based superconductors
• "Universal" ${\Delta }_{max}/T_c$ in Fe Based Superconductors