Correlation-Driven Electronic Reconstruction in FeTe${}_{1-x}$Se${}_x$

Abstract

Electronic correlation is of fundamental importance to high temperature superconductivity. While the low energy electronic states in cuprates are dominantly affected by correlation effects across the phase diagram, observation of correlation-driven changes in fermiology amongst the iron-based superconductors remains rare. Here we present experimental evidence for a correlation-driven reconstruction of the Fermi surface tuned independently by two orthogonal axes of temperature and Se/Te ratio in the iron chalcogenide family FeTe${}_{1-x}$Se${}_x$. We demonstrate that this reconstruction is driven by the de-hybridization of a strongly renormalized $d_{xy}$ orbital with the remaining itinerant iron 3$d$ orbitals in the emergence of an orbital-selective Mott phase. Our observations are further supported by our theoretical calculations to be salient spectroscopic signatures of such a non-thermal evolution from a strongly correlated metallic phase into an orbital-selective Mott phase in $d_{xy}$ as Se concentration is reduced.

25 pages, 5 figures, accepted version to appear in Communications Physics. arXiv admin note: text overlap with arXiv:2010.13913

References in corpus (40)

• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• High-temperature superconductivity in iron-based materials
• Quantum Criticality in Heavy Fermion Metals
• Strong electronic correlations from Hund's coupling
• Extreme Sensitivity of Superconductivity to Stoichiometry in FeSe (Fe1+dSe)
• Incommensurate magnetic order in the alpha-Fe(Te,Se) superconductor systems
• Heavy Fermions and Quantum Phase Transitions
• First-order magnetic and structural phase transitions in Fe${}_{1+y}$Se${}_x$Te${}_{1-x}$
• Magnetism and its microscopic origin in iron-based high-temperature superconductors
• The Structural Phase Transition in FeSe (Fe1+dSe)
• From (pi, 0) magnetic order to superconductivity with (pi, pi) magnetic resonance in Fe1.02(Te1-xSex)
• Orbital selective Mott transition in multi-band systems: slave-spin representation and dynamical mean-field theory
• Spin Gap and Resonance at the Nesting Wavevector in Superconducting FeSe0.4Te0.6
• Observation of Temperature-Induced Crossover to an Orbital-Selective Mott Phase in A${}_x$Fe${}_{2-y}$Se${}_2$ (A=K, Rb) Superconductors
• Orbital-selective Mott Phase in Multiorbital Models for Alkaline Iron Selenides K(1-x)Fe(2-y)Se2
• Pseudogap opening and formation of Fermi arcs as an orbital-selective Mott transition in momentum space
• Fractional power-law behavior and its origin in iron-chalcogenide and ruthenate superconductors: Insights from first-principles calculations
• Dynamics and mechanism of oxygen annealing in Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$ single crystal
• Formation of Hubbard-like bands as a fingerprint of strong electron-electron interactions in FeSe
• Anisotropic spin fluctuations in detwinned FeSe
• Magnetic field tuned quantum criticality of heavy fermion system YbPtBi
• High Energy Dispersions in Bi2Sr2CaCu2O8 High Temperature Superconductor from Laser-Based Angle-Resolved Photoemission
• Orbital-selective Mott phase in multiorbital models for iron pnictides and chalcogenides
• Influence of interstitial Fe to the phase diagram of Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ single crystals
• Itinerant Nature of U 5f States in Uranium Mononitride UN Revealed by Angle Resolved Photoelectron Spectroscopy
• Orbital-differentiated coherence-incoherence crossover identified by photoemission spectroscopy in LiFeAs
• Evidence for a cos(4φ) Modulation of the Superconducting Energy Gap of Optimally Doped FeTe_{0.6}Se_{0.4} Single Crystals Using Laser Angle-Resolved Photoemission Spectroscopy
• Evolution from incoherent to coherent electronic states and its implications to superconductivity in FeTe1-xSex
• Unconventional Hall effect in pnictides from interband interactions
• Effects of Annealing under Tellurium Vapor for Fe${}_{1.03}$Te${}_{0.8}$Se${}_{0.2}$ Single Crystals
• Direct observation of dispersive lower Hubbard band in iron-based superconductor FeSe
• Emergence of a common energy scale close to the orbital-selective Mott transition
• Incoherent-coherent crossover and the pseudogap in Te-annealed superconducting Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ revealed by magnetotransport measurements
• Evolution of superconducting and transport properties in annealed FeTe${}_{1-x}$Se${}_x$ (0.1 $\le$ $x$ $\le$ 0.4) multiband superconductors
• Orbital-selective spin waves in detwinned NaFeAs
• Spin fluctuation anisotropy as a probe of orbital-selective hole-electron quasiparticle excitations in detwinned Ba(Fe1-xCox)2As2
• Observation of an Emergent Coherent State in the Iron-Based Superconductor KFe${}_2$As${}_2$
• On the role of chalcogen vapor annealing in inducing bulk superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Low energy magnetic excitations from the Fe${}_{1+y-z}$(Ni/Cu)${}_z$Te${}_{1-x}$Se${}_x$ system
• Observation of Kondo hybridization with an orbital-selective Mott phase in 4d Ca2-xSrxRuO4