Experimental Observation of Incoherent-Coherent Crossover and Orbital Dependent Band Renormalization in Iron Chalcogenide Superconductors

Abstract

The level of electronic correlation has been one of the key questions in understanding the nature of superconductivity. Among the iron-based superconductors, the iron chalcogenide family exhibits the strongest electron correlations. To gauge the correlation strength, we performed systematic angle-resolved photoemission spectroscopy study on the iron chalcogenide series Fe${}_{1+y}$Se${}_x$Te${}_{1-x}$ (0$<$x$<$0.59), a model system with the simplest structure. Our measurement reveals an incoherent to coherent crossover in the electronic structure as the selenium ratio increases and the system evolves from the weakly localized to more itinerant state. Furthermore, we found that the effective mass of bands dominated by the d${}_{xy}$ orbital character significantly decreases with increasing selenium ratio, as compared to the d${}_{xz}$/d${}_{yz}$ orbital-dominated bands. The orbital dependent change in the correlation level agrees with theoretical calculations on the band structure renormalization, and may help to understand the onset of superconductivity in Fe${}_{1+y}$Se${}_x$Te${}_{1-x}$.

7 pages, 4 figures

References in corpus (16)

• High-temperature superconductivity in iron-based materials
• Density functional study of FeS, FeSe and FeTe: Electronic structure, magnetism, phonons and superconductivity
• First-order magnetic and structural phase transitions in Fe${}_{1+y}$Se${}_x$Te${}_{1-x}$
• A review of Fe-chalcogenide superconductors: the simplest Fe-based superconductor
• Orbital-Selective Mott transition out of band degeneracy lifting
• From (pi, 0) magnetic order to superconductivity with (pi, pi) magnetic resonance in Fe1.02(Te1-xSex)
• Theoretical evidence for strong correlations and incoherent metallic state in FeSe
• Orbital selective Mott transition in multi-band systems: slave-spin representation and dynamical mean-field theory
• Observation of Temperature-Induced Crossover to an Orbital-Selective Mott Phase in A${}_x$Fe${}_{2-y}$Se${}_2$ (A=K, Rb) Superconductors
• Observation of universal strong orbital-dependent correlation effects in iron chalcogenides
• Orbital-selective Mott Phase in Multiorbital Models for Alkaline Iron Selenides K(1-x)Fe(2-y)Se2
• Fractional power-law behavior and its origin in iron-chalcogenide and ruthenate superconductors: Insights from first-principles calculations
• Disappearance of static magnetic order and evolution of spin fluctuations in Fe${}_{1+\delta }$Se${}_x$Te${}_{1-x}$
• Measurement of Coherent Polarons in the Strongly Coupled Antiferromagnetically Ordered Iron-Chalcogenide Fe1.02Te using Angle-Resolved Photoemission Spectroscopy
• Evolution from incoherent to coherent electronic states and its implications to superconductivity in FeTe1-xSex
• Doping-Dependent and Orbital-Dependent Band Renormalization in Ba(Fe_1-xCo_x)_2As_2 Superconductors

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• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Suppression of electronic correlations by chemical pressure from FeSe to FeS
• Orbital selective pairing and superconductivity in iron selenides
• Orbital selectivity and emergent superconducting state from quasi-degenerate $s-$ and $d-$wave pairing channels in iron-based superconductors
• A strongly inhomogeneous superfluid in an iron-based superconductor
• Optical properties of the infinite-layer La${}_{1-x}$Sr${}_x$NiO${}_2$ and hidden Hund's physics
• Magnetic, superconducting, and topological surface states on Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Non-Thermal Emergence of an Orbital-Selective Mott Phase in FeTe${}_{1-x}$Se${}_x$
• Correlation-Driven Electronic Reconstruction in FeTe${}_{1-x}$Se${}_x$
• Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx
• Orbital differentiation in Hund metals
• Orbital selectivity enhanced by nematic order in FeSe
• Orbital selectivity in electron correlations and superconducting pairing of iron-based superconductors
• Interplay of nematic and magnetic orders in FeSe under pressure
• Is the orbital-selective Mott phase stable against interorbital hopping?
• Orbital selective spin excitations and their impact on superconductivity of LiFe1-xCoxAs
• Effect of electron correlations on the electronic structure and phase stability of FeSe upon lattice expansion
• Correlation strength, Lifshitz transition and the emergence of a two- to three-dimensional crossover in FeSe under pressure
• Electronic structure of FeS
• Strong correlations and the search for high-Tc superconductivity in chromium pnictides and chalcogenides
• Enhanced superconducting pairing strength near a nonmagnetic nematic quantum critical point
• Incoherent-coherent crossover and the pseudogap in Te-annealed superconducting Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ revealed by magnetotransport measurements
• Temperature-induced band selective localization and coherent-incoherent crossover in single-layer FeSe/Nb:BaTiO3 /KTaO3
• Magnetism and superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Direct visualization of sign reversal s^+- superconducting gaps in FeTe0.55Se0.45
• Prediction of orbital selective Mott phases and block magnetic states in the quasi-one-dimensional iron chain Ce${}_2$O${}_2$FeSe${}_2$ under hole and electron doping
• Electronic structure and nematic phase transition in superconducting multi-layer FeSe films grown by pulsed laser deposition method
• The Coulomb problem in iron based superconductors
• Unconventional localization of electrons inside of a nematic electronic phase
• Bulk and surface Dirac states accompanied by two superconducting domes in FeSe-based superconductors
• Nematic Fluctuations in an Orbital Selective Superconductor Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Orbital-selective bad metals due to Hund's rule and orbital anisotropy: a finite-temperature slave-spin treatment of the two-band Hubbard model
• Tuning across the BCS-BEC crossover in the multiband superconductor Fe${}_{1+y}$Se${}_x$Te${}_{1-x}$ : An angle-resolved photoemission study
• Orbital-Selective High-Temperature Cooper Pairing Developed in the Two-Dimensional Limit
• Emergent spin-glass state in the doped Hund's metal CsFe2As2
• Orbital-selective correlations and renormalized electronic structure in LiFeAs
• Resurgence of superconductivity and the role of $d_{xy}$ hole band in FeSe${}_{1-x}$Te${}_x$
• Electronic phase diagram of Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ revealed by magnetotransport measurements
• Exploring itinerant states in divalent hexaborides using rare-earth $L$ edge resonant inelastic X-ray scattering
• Evolution of charge dynamics in FeSe${}_{1-x}$Te${}_x$: Effects of electronic correlations and nematicity
• Triplet pairing, orbital selectivity and correlations in Iron-based superconductors
• Evolution of the intertwining correlated topological phases in iron-based superconductor Fe(Te,Se)
• Electronic phase diagram in Te-annealed superconducting FeTe${}_{1-x}$Se${}_x$ revealed by magnetic susceptibility
• PhD Thesis: Electronic correlations in multiorbital systems