Anomalous High-Energy Electronic Interaction in Iron-Based Superconductor

Abstract

Strong electron interactions in solids increase effective mass, and shrink the electronic bands [1]. One of the most unique and robust experimental facts about iron-based superconductors [2-4] is the renormalization of the conduction band by factor of 3 near the Fermi level [5-9]. Obviously related to superconductivity, this unusual behaviour remains unexplained. Here, by studying the momentum-resolved spectrum of the whole valence band in a representative material, we show that this phenomenon originates from electronic interaction on a much larger energy scale. We observe an abrupt depletion of the spectral weight in the middle of the Fe $3d$ band, which is accompanied by a drastic increase of the scattering rate. Remarkably, all spectral anomalies including the low-energy renormalization can be explained by coupling to excitations, strongly peaked at about 0.5 eV. Such high-energy interaction distinguishes all unconventional superconductors from common metals.

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Cited by in corpus (11)

• Formation of Hubbard-like bands as a fingerprint of strong electron-electron interactions in FeSe
• Anomalous temperature evolution of the electronic structure of FeSe
• The three-dimensional electronic structure of the nematic and antiferromagnetic phases of NaFeAs from detwinned ARPES measurements
• Electronic band structure of optimal superconductors: from cuprates to ferropnictides and back again
• Direct observation of spin-orbit coupling in iron-based superconductors
• Strong surface termination dependence of the electronic structure of polar superconductor LaFeAsO revealed by nano-ARPES
• High-pressure self-flux growth and characterization of Li-deficient Li0.95FeAs single crystals
• Dispersion kinks from electronic correlations in an unconventional iron-based superconductor
• Quantitative comparison of LDA+DMFT and ARPES spectral functions
• Magnetic excitations in the normal and nematic phases of iron pnictides
• Energy-Resolved Real-Space Imaging of Orbital Nematicity in an Fe-Based Superconductor