Orbital-differentiated coherence-incoherence crossover identified by photoemission spectroscopy in LiFeAs

Abstract

In the iron-based superconductors (FeSCs), orbital differentiation is an important phenomenon, whereby correlations stronger on the dxy orbital than on the dxz/yz orbital yield quasi-particles with dxy} orbital character having larger mass renormalization and abnormal temperature evolution. However, the physical origin of this orbital differentiation is debated between the Hund's coupling induced unbinding of spin and orbital degrees of freedom and the Hubbard interaction instigated orbital selective Mott transition. Here we use angle-resolved photoemission spectroscopy to identify an orbital-dependent correlation-induced quasi-particle (QP) anomaly in LiFeAs. The excellent agreement between our photoemission measurements and first-principles many-body theory calculations shows that the orbital-differentiated QP lifetime anomalies in LiFeAs are controlled by the Hund's coupling.

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Cited by in corpus (35)

• Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy
• High-resolution photoemission on Sr2RuO4 reveals correlation-enhanced effective spin-orbit coupling and dominantly local self-energies
• Optical properties of the infinite-layer La${}_{1-x}$Sr${}_x$NiO${}_2$ and hidden Hund's physics
• Non-Thermal Emergence of an Orbital-Selective Mott Phase in FeTe${}_{1-x}$Se${}_x$
• Correlation-Driven Electronic Reconstruction in FeTe${}_{1-x}$Se${}_x$
• Orbital differentiation in Hund metals
• Orbital-selective Mott phase in multiorbital models for iron pnictides and chalcogenides
• 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
• Effect of non-local correlations on the electronic structure of LiFeAs
• Is the orbital-selective Mott phase stable against interorbital hopping?
• Hall coefficient signals orbital differentiation in the Hund's metal Sr${}_2$RuO${}_4$
• Evidence of hot and cold spots on the Fermi surface of LiFeAs
• Differentiating Hund from Mott physics in a three-band Hubbard-Hund model: Temperature dependence of spectral, transport, and thermodynamic properties
• Decoupled Pairing Amplitude and Electronic Coherence in Iron-Based Superconductors
• Experimental evidence for the importance of Hund's exchange interaction for the incoherence of the charge carriers in iron-based superconductors
• Analytical slave-spin mean-field approach to orbital selective Mott insulators
• Breakdown of Fermi liquid theory in topological multi-Weyl semimetals
• Emergent low-energy bound states in the two-orbital Hubbard model
• Kondo interaction in FeTe and its potential role in the magnetic order
• Orbital-selective spin waves in detwinned NaFeAs
• Correlation Driven Phonon Anomalies in Bulk FeSe
• On the Spatial Locality of Electronic Correlations in LiFeAs
• Observation of an Emergent Coherent State in the Iron-Based Superconductor KFe${}_2$As${}_2$
• Detecting sign-changing superconducting gap in LiFeAs using quasiparticle interference
• Site and orbital selective correlations in $\beta$-Pu
• Orbital-dependent correlations in PuCoGa${}_5$
• Quasiparticle characteristics of the weakly ferromagnetic Hund's metal MnSi
• Orbital-selective bad metals due to Hund's rule and orbital anisotropy: a finite-temperature slave-spin treatment of the two-band Hubbard model
• Orbital-selective correlations and renormalized electronic structure in LiFeAs
• The Hund's Superconductor Li(Fe,Co)As
• Evidence for bosonic mode coupling in electron dynamics of LiFeAs superconductor
• A dynamical mean-field study of orbital-selective Mott phase enhanced by next-nearest neighbor hopping
• "Universal" ${\Delta }_{max}/T_c$ in Fe Based Superconductors
• Strong local moment antiferromagnetic spin fluctuations in V-doped LiFeAs